To see the other types of publications on this topic, follow the link: Flexible Sensors.
Journal articles on the topic 'Flexible Sensors'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Flexible Sensors.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Chen, Junru. "Flexible Pressure Sensors and Their Applications." Highlights in Science, Engineering and Technology 44 (April 13, 2023): 54–60. http://dx.doi.org/10.54097/hset.v44i.7193.
Full textAbstract:
The application of flexible pressure sensor is a new type of pressure sensor based on new materials prepared by a nano process. It differs from conventional pressure sensors due to its good flexibility, free bending, small thickness, high sensitivity, and ease of mass production, and is particularly suited for measuring soft surface contact stress. It has several potential applications in smart homes, smart medicine, wearable gadgets, and other domains. The microstructure can not only increase the sensor's sensitivity, but it can also recover the sensor's elastic deformation more quickly, so it has a swift duty. The capacitive flexible pressure sensor will be introduced first, followed by the resistive pressure sensor, and then their practical applications will be discussed. This paper's research will contribute significantly to the study and implementation of flexible pressure sensors. It will contribute significantly to the study and application of flexible pressure sensors.
2
Syamimi, Nor, and Shuhaida Yahud. "General design criteria for neonatal temperature monitoring sensor using "smart material" conducting polymer development: A review." Applied Research and Smart Technology (ARSTech) 2, no. 1 (June 23, 2021): 18–26. http://dx.doi.org/10.23917/arstech.v2i1.185.
Full textAbstract:
Surface thermistors are being currently used in patient monitoring, including temperature monitoring among neonates. However, these thermistors are reported as being mechanically rigid. This review article aims to provide researchers with a guide to better design a flexible neonatal temperature monitoring sensor. A literature search was conducted to obtain available literature on temperature sensors with specific attention to designing flexible temperature sensors. The achievement of a flexible type thermistor for neonates requires a basic understanding of the thermistor. Also, the conducting polymer material being used and the rationale for their placement. The updated technology in thermistors should be made flexible for the ease of neonates during monitoring. Careful considerations for the design and conduct of flexible temperature sensor research as outlined in this review would help to enhance the quality and comparability of future research studies. Considerations for efficient neonatal temperature monitoring and protection include accuracy, sensor's size, weight, material, and sensor placement. Flexible sensors could be the alternative to conventional bulky and stiff temperature sensors.
3
Liu, Haotian, Beining Zhang, and Ziang Zheng. "Flexible pressure sensor for the detection of human body signals." Applied and Computational Engineering 7, no. 1 (July 21, 2023): 507–15. http://dx.doi.org/10.54254/2755-2721/7/20230428.
Full textAbstract:
In 2016, flexible sensors only accounted for 8% of the market share, but in 2018, they increased to 27%, and the development trend is still rising. In scientific research, the research on flexible sensors is very hot. It can be seen that flexible sensors are one of the key topics of current research. Researchers have found that this type of sensor has good ductility and portability. However, there is a gap in the field of biological signals for flexible sensors. The flexibility of flexible sensors explores the credibility of the flexible sensor in detecting human pulse signals. It uses different machines, such as a multimeter, and SEM, to verify whether its basic properties, including stability and sensitivity, meet the needs of detecting human signals. The flexible sensor has good stability. Because it is made of RGO, it has higher sensitivity. The converted electrical signal is easier to receive and analyze. Using PDMS as the base material of the flexible sensor can make the flexible sensor have better bendability. This paper introduces the current world of common flexible sensors and different kinds of flexible sensors in different fields of application. The fabrication of a flexible pressure sensor based on RGO is then described in detail. Moreover, the basic properties of flexible pressure sensors are used to verify the possibility of detecting signals for the human body.
4
Cao, Yuxuan. "Resent Researches and Applications on Piezoresistive Flexible Pressure Sensor." E3S Web of Conferences 553 (2024): 05006. http://dx.doi.org/10.1051/e3sconf/202455305006.
Full textAbstract:
Recent developments in piezoresistive flexible pressure sensors have generated a lot of interest because of the possible uses across numerous industries. With a focus on improving sensor performance, this paper covers current developments in the area of piezoresistive flexible pressure sensors. Over the years, there has been a growing interest in improving the capabilities of these sensors, leading researchers to explore various avenues for enhancement. The review highlights two primary areas of research: the optimization of active materials and the enhancement of sensor structures. These areas are actively being investigated to achieve superior sensor performance and overall functionality. In addition to utilizing high-quality materials, optimizing the sensor’s structure is crucial for achieving improved sensitivity, accuracy, and stability. The review also explores the wide range of applications where pressure sensors have made significant contributions, including human motion monitoring, healthcare, and other domains. Flexible and highly sensitive pressure sensors have the potential to revolutionize several sectors and open up new opportunities.
5
Palanisamy, Srinivasan, Muthuramalingam Thangaraj, Khaja Moiduddin, Hisham Alkhalefah, Panagiotis Karmiris-Obratański, and Cheng Siong Chin. "Design, Fabrication, and Optimization of a Printed Ag Nanoparticle-Based Flexible Capacitive Sensor for Automotive IVI Bezel Display Applications." Sensors 23, no. 9 (April 23, 2023): 4211. http://dx.doi.org/10.3390/s23094211.
Full textAbstract:
Since printed capacitive sensors provide better sensing performance, they can be used in automotive bezel applications. It is necessary to fabricate such sensors and apply an optimization approach for choosing the optimal sensor pattern. In the present work, an effort was made to formulate interdigitated pattern-printed Silver (Ag) electrode flexible sensors and adopt the Taguchi Grey Relational (TGR)-based optimization approach to enhance the flexible sensor’s panel for enhanced automobile infotainment applications. The optimization technique was performed to derive better design considerations and analyze the influence of the sensor’s parameters on change in capacitance when touched and production cost. The fabricated flexible printed sensors can provide better sensing properties. A design pattern which integrates an overlap of 15 mm, an electrode line width of 0.8 mm, and an electrode gap 0.8 mm can produce a higher change in capacitance and achieve a lower weight. The overlap has a greater influence on sensor performance owing to its optimization of spatial interpolation.
6
Pistriţu, Florian, Marin Gheorghe, Marian Ion, Oana Brincoveanu, Cosmin Romanitan, Mirela Petruta Suchea, Paul Schiopu, and Octavian Narcis Ionescu. "On the Development of a New Flexible Pressure Sensor." Micromachines 15, no. 7 (June 29, 2024): 847. http://dx.doi.org/10.3390/mi15070847.
Full textAbstract:
The rapid advancement of the Internet of Things (IoT) serves as a significant driving force behind the development of innovative sensors and actuators. This technological progression has created a substantial demand for new flexible pressure sensors, essential for a variety of applications ranging from wearable devices to smart home systems. In response to this growing need, our laboratory has developed a novel flexible pressure sensor, designed to offer an improved performance and adaptability. This study aims to present our newly developed sensor, detailing the comprehensive investigations we conducted to understand how different parameters affect its behaviour. Specifically, we examined the influence of the resistive layer thickness and the elastomeric substrate on the sensor’s performance. The resistive layer, a critical component of the sensor, directly impacts its sensitivity and accuracy. By experimenting with varying thicknesses, we aimed to identify the optimal configuration that maximizes sensor efficiency. Similarly, the elastomeric substrate, which provides the sensor’s flexibility, was scrutinized to determine how its properties affect the sensor’s overall functionality. Our findings highlight the delicate balance required between the resistive layer and the elastomeric substrate to achieve a sensor that is both highly sensitive and durable. This research contributes valuable insights into the design and optimization of flexible pressure sensors, paving the way for more advanced IoT applications.
7
Feng, Ziyi, Ziyang Liu, Tianying Shao, and Yifei Zhang. "Application of nanomaterials in flexible sensors." Applied and Computational Engineering 23, no. 1 (November 7, 2023): 162–69. http://dx.doi.org/10.54254/2755-2721/23/20230647.
Full textAbstract:
Flexible electronic sensors have widespread applications in both traditional and emerging fields, particularly for human-computer interaction (electronic skins, wearable electronic devices) and physical and environmental monitoring for people. Flexible electronic sensors can be bent and folded readily without interfering with their detecting performance. However, researchers still face many difficulties. For instance, traditional flexible materials (such as organic materials) are less sensitive to external signals, and the production progress of flexible sensors is complicated. This review recapitulates applications of nanomaterials in flexible electronic sensors. Firstly, the working principles and applications of three common types of flexible electronic sensors, the piezoresistive sensor, the capacitive sensor, and the piezoelectric sensor, are introduced. Then, the paper summarizes methods for improving sensors performance in health monitoring, disease diagnosis and biological detection by application of different nanomaterials to flexible substrates. Finally, the future development of flexible nanomaterial sensors prospects. It is found that nanocomposites of metal nanomaterials, carbon nanomaterials and other polymers with unique tuned photoelectrical properties show enhanced performance as flexible sensors and further research is needed to improve the material-substrate integration to promote the large-scale application as wearable sensors.
8
Song, Chenyu. "Flexible Capacitive Pressure Sensors and Approaches to Enhance Sensitivity." Highlights in Science, Engineering and Technology 44 (April 13, 2023): 41–48. http://dx.doi.org/10.54097/hset.v44i.7191.
Full textAbstract:
Many research groups have become interested in the flexible capacitive pressure sensor in recent years. It has many applications, such as electronic skin and fingerprint collection devices. One of the challenges is optimizing the sensor's design, which can be achieved by improving its sensitivity. The flexible capacitive pressure sensor outperforms other pressure sensors in terms of efficiency, response time, and cost. In the future, more applications will use the flexible capacitive pressure sensor as the component. Thus, improving its sensitivity becomes significant. The topic of this review is to briefly introduce the flexible capacitive pressure sensor's mechanism, how to achieve high sensitivity and any potential applications that already exist in the market. It will also go over some experiments to improve the sensor's sensitivity and their benefits. In the end, the future expectations of the capacitive pressure sensor will also be discussed. The topic of this review will be significant to the development of electronic devices.
9
Li, Pengfei, Zhijie Li, Hongyue Chen, Yunji Zhu, Dada Yang, and Yang Hou. "Graphene-Based Flexible Strain Sensor Based on PDMS for Strain Detection of Steel Wire Core Conveyor Belt Joints." Sensors 23, no. 17 (August 28, 2023): 7473. http://dx.doi.org/10.3390/s23177473.
Full textAbstract:
Because of their superior performance, flexible strain sensors are used in a wide range of applications, including medicine and health, human–computer interaction, and precision manufacturing. Flexible strain sensors outperform conventional silicon-based sensors in high-strain environments. However, most current studies report complex flexible sensor preparation processes, and research focuses on enhancing and improving one parameter or property of the sensors, ignoring the feasibility of flexible strain sensors for applications in various fields. Since the mechanical properties of flexible sensors can be well combined with rubber conveyor belts, in this work polydimethylsiloxane (PDMS) was used as a flexible substrate by a simple way of multiple drop coating. Graphene-based flexible strain sensor films that can be used for strain detection at the joints of steel cord core conveyor belts were successfully fabricated. The results of the tests show that the sensor has a high sensitivity and can achieve a fast response (response time: 43 ms). Furthermore, the sensor can still capture the conveyor belt strain after withstanding high pressure (1.2–1.4 MPa) and high temperature (150 °C) during the belt vulcanization process. This validates the feasibility of using flexible strain sensors in steel wire core conveyor belts and has some potential for detecting abnormal strains in steel wire core conveyor belt, broadening the application field of flexible sensors.
10
Zhang, Ziyan. "Principle and Application of Flexible Pressure Sensors." SHS Web of Conferences 157 (2023): 01026. http://dx.doi.org/10.1051/shsconf/202315701026.
Full textAbstract:
Flexible pressure sensors are widely used in many ways, including health care and machine sensors. Compared with the traditional flexible pressure sensor, flexible pressure sensor has quality is light, easy to carry and deformation degree higher advantages are modern science and technology advanced has broad prospects for the development of technology products. In recent years, Remarkable progress has been made in the field of flexible pressure sensors. However, it is still a big challenge to realize the high resolution, high sensitivity, fast response, low-cost manufacturing and complex signal detection of flexible pressure sensors. This paper will introduce the mechanism of the flexible pressure sensor and improve the sensitivity by using the microstructure and the practical application. The research in this paper will have a very important value for the research and application of the flexible pressure sensor.
11
Zhou, Xiaodong, Hongxin Zang, Yong Guan, Shuangjian Li, and Mingming Liu. "Superhydrophobic Flexible Strain Sensors Constructed Using Nanomaterials: Their Fabrications and Sustainable Applications." Nanomaterials 13, no. 19 (September 26, 2023): 2639. http://dx.doi.org/10.3390/nano13192639.
Full textAbstract:
Superhydrophobic flexible strain sensors, which combine superhydrophobic coatings with highly sensitive flexible sensors, significantly enhance sensor performance and expand applications in human motion monitoring. Superhydrophobic coatings provide water repellency, surface self-cleaning, anti-corrosion, and anti-fouling properties for the sensors. Additionally, they enhance equipment durability. At present, many studies on superhydrophobic flexible sensors are still in the early research stage; the wear resistance and stability of sensors are far from reaching the level of industrial application. This paper discusses fundamental theories such as the wetting mechanism, tunneling effect, and percolation theory of superhydrophobic flexible sensors. Additionally, it reviews commonly used construction materials and principles of these sensors. This paper discusses the common preparation methods for superhydrophobic flexible sensors and summarizes the advantages and disadvantages of each method to identify the most suitable approach. Additionally, this paper summarizes the wide-ranging applications of the superhydrophobic flexible sensor in medical health, human motion monitoring, anti-electromagnetic interference, and de-icing/anti-icing, offering insights into these fields.
12
Navone, Christelle, Mathieu Soulier, Isabella Chartier, Julia Simon, Aurelien Oliveira, Claudine Gehin, and Thierry Pauchard. "Flexible Heat Flux Sensor for Firefighters Garment Integration." International Journal of E-Health and Medical Communications 4, no. 1 (January 2013): 36–45. http://dx.doi.org/10.4018/jehmc.2013010104.
Full textAbstract:
The interest in using optimal equipment to face unknown hazards is growing, as it ultimately save lives. This holds especially true for fire-fighters which are confronted with other hazards during the course of operations. Improvement of their security by an integrated sensory clothing system was the main objective of the European project ProeTEX. In this context, the integration of commercial heat flux sensors into fire-fighters garment has proved the interest of such measurements. However, low flexibility and high cost remain major disadvantages of these sensors. The objective of this work is to develop an innovative heat flux sensor based on a low cost technology. Heat flux sensors have been realized using printable thermoelectric materials and present high sensitivity (146 mV/ (W/cm2)). Their flexibility is compatible with integration in clothes and three specific integrations are proposed and compared. Proof of concept of flexible heat flux sensor is also presented in this paper.
13
Wang, Jiatong. "Research of flexible sensor based on nanomaterial." Applied and Computational Engineering 60, no. 1 (May 7, 2024): 148–53. http://dx.doi.org/10.54254/2755-2721/60/20240860.
Full textAbstract:
A flexible sensor is a sensor made of flexible materials, generally composed of three layers: base layer, sensing layer, and packaging layer, can be widely used in medical electronics, biological monitoring, wearable electronics and other fields. Compared with traditional electronic devices, flexible electronics have cheap substrates and can be attached to curved surfaces to achieve sensing functions, which attract researchers in different fields. In recent years, the development of nanotechnology and polymer materials has greatly promoted the innovation of flexible electronics. This paper focuses on the application of nanotechnology in flexible sensing. Through horizontal induction and analysis of nanotechnologies in polymer -based sensors, hydrogel sensors, self-powered sensors and other sensors, suggestions for continuous detection and clinical treatment of sensors are put forward vertically. Achieving the structure and intrinsic flexibility of the flexible sensor substrate, deposition of the micro-circuit onto the substrate, encapsulation without breaking the ductility condition, maximizing its conductive, thermal and mechanical response, self-powered, degradability and other properties that meet human needs are all the focus of the flexible electronics discussion. In this paper, the structure, response and drug delivery of the flexible sensor will be analyzed and discussed from the Angle of material.
14
Choe, K., and H. Baruh. "Sensor Failure Detection in Flexible Structures Using Modal Observers." Journal of Dynamic Systems, Measurement, and Control 115, no. 3 (September 1, 1993): 411–18. http://dx.doi.org/10.1115/1.2899117.
Full textAbstract:
A procedure is developed to detect sensor failures in flexible structures by means of observers designed at the modal level. Estimates of the modal coordinates generated by the modal observers are used to estimate the system output at the sensor’s locations. These estimates of the system output are then compared with the sensors’ measurements to detect failure. It is shown that, when the observer gains are properly selected, failure of a certain sensor primarily affects the estimate of that sensor, and it affects the estimates of the operational sensors much less. This makes it possible to detect multiple sensor failures. Because the observers are designed for each mode individually, one can obtain closed-form expressions for the observer poles, making the failure detection procedure applicable to high-order systems.
15
Nguyen, Thanh-Hai, Ba-Viet Ngo, Thanh-Nghia Nguyen, and Chi Cuong Vu. "Flexible Pressure Sensors and Machine Learning Algorithms for Human Walking Phase Monitoring." Micromachines 14, no. 7 (July 13, 2023): 1411. http://dx.doi.org/10.3390/mi14071411.
Full textAbstract:
Soft sensors are attracting much attention from researchers worldwide due to their versatility in practical projects. There are already many applications of soft sensors in aspects of life, consisting of human-robot interfaces, flexible electronics, medical monitoring, and healthcare. However, most of these studies have focused on a specific area, such as fabrication, data analysis, or experimentation. This approach can lead to challenges regarding the reliability, accuracy, or connectivity of the components. Therefore, there is a pressing need to consider the sensor’s placement in an overall system and find ways to maximize the efficiency of such flexible sensors. This paper proposes a fabrication method for soft capacitive pressure sensors with spacer fabric, conductive inks, and encapsulation glue. The sensor exhibits a good sensitivity of 0.04 kPa−1, a fast recovery time of 7 milliseconds, and stability of 10,000 cycles. We also evaluate how to connect the sensor to other traditional sensors or hardware components. Some machine learning models are applied to these built-in soft sensors. As expected, the embedded wearables achieve a high accuracy of 96% when recognizing human walking phases.
16
Gao, Ke, Zhiyue Zhang, Shun Weng, Hongping Zhu, Hong Yu, and Tingjun Peng. "Review of Flexible Piezoresistive Strain Sensors in Civil Structural Health Monitoring." Applied Sciences 12, no. 19 (September 28, 2022): 9750. http://dx.doi.org/10.3390/app12199750.
Full textAbstract:
Owing to the outstanding sensing properties, especially high sensitivity and large stretchability, flexible piezoresistive strain sensors are advantageous for achieving intelligent sensing and have become a popular topic in the field of civil structural health monitoring (SHM). To explore advanced flexible strain sensors for civil SHM, this paper summarizes the recent research progress, achievements and challenges in flexible piezoresistive strain sensors. First, four common piezoresistive mechanisms are introduced theoretically. Sensor materials, including conductive materials, flexible substrates and electrodes, are explained in detail. Second, essential sensing parameters are interpreted and then followed by specific explanations of improvement strategies for the sensor performance in terms of each parameter. Third, applications of flexible piezoresistive strain sensors in the deformation measurement and damage detection of steel structures, concrete structures and fiber-reinforced composite structures are presented. Existing challenges and prospects in the practical application and large-scale production of flexible strain sensors are also reported. Last but not least, strategies for the selection of piezoresistive sensors for civil SHM are explained.
17
Xu, Lingtian. "Flexible Tactile Sensors in Electronic Skins." Highlights in Science, Engineering and Technology 52 (July 4, 2023): 161–67. http://dx.doi.org/10.54097/hset.v52i.8883.
Full textAbstract:
With the rapid development of robot technology, robot is widely used in daily life. According to different functions, the new generation of robots can be classified into social robots, medical robots, auxiliary robots and humanoid robots. Compared with traditional human-controlled industrial robots, these new-generation robots have the characteristics of close interaction, so it is particularly important to have a safe and accurate interaction system, and the tactile sensor has become the key to achieve this function. Tactile sensors can mimic human skin, and they can express temperature, humidity, force and other senses in a digital way, so that the robot can perform tasks completely and accurately in the process of interacting with the external environment. Flexible tactile sensors have the advantages of flexibility, light weight, versatility and affordability and have possible applications in wearable electronics and artificial intelligence. Therefore, more and more researchers began to study tactile sensors. This review gives an overview of advanced flexible tactile sensors, which focuses on the working principle, new materials and application prospect of three mainstream flexible tactile devices, namely piezoelectric sensor, conductive sensor and resistive tactile sensor. Finally, possible routes, future tendency and new opportunities are presented.
18
Mijit, Abduweli, Shuo Li, Qiang Wang, Mingzhou Li, and Yanlong Tai. "Silver Nanowire-Based Flexible Strain Sensor for Human Motion Detection." Sensors 24, no. 11 (May 23, 2024): 3329. http://dx.doi.org/10.3390/s24113329.
Full textAbstract:
Accurately capturing human movements is a crucial element of health status monitoring and a necessary precondition for realizing future virtual reality/augmented reality applications. Flexible motion sensors with exceptional sensitivity are capable of detecting physical activities by converting them into resistance fluctuations. Silver nanowires (AgNWs) have become a preferred choice for the development of various types of sensors due to their outstanding electrical conductivity, transparency, and flexibility within polymer composites. Herein, we present the design and fabrication of a flexible strain sensor based on silver nanowires. Suitable substrate materials were selected, and the sensor’s sensitivity and fatigue properties were characterized and tested, with the sensor maintaining reliability after 5000 deformation cycles. Different sensors were prepared by controlling the concentration of silver nanowires to achieve the collection of motion signals from various parts of the human body. Additionally, we explored potential applications of these sensors in fields such as health monitoring and virtual reality. In summary, this work integrated the acquisition of different human motion signals, demonstrating great potential for future multifunctional wearable electronic devices.
19
Zhang, Haozhe, Junwen Zhu, Yujia Yang, Qiang Liu, Wei Xiong, and Xing Yang. "Inductive Paper-Based Flexible Contact Force Sensor Utilizing Natural Micro-Nanostructures of Paper: Simplicity, Economy, and Eco-Friendliness." Micromachines 15, no. 7 (July 7, 2024): 890. http://dx.doi.org/10.3390/mi15070890.
Full textAbstract:
Inductive contact force sensors, known for their high precision and anti-interference capabilities, hold significant potential applications in fields such as wearable and medical monitoring devices. Most of the current research on inductive contact force sensors employed novel nanomaterials as sensitive elements to enhance their sensitivity and other performance characteristics. However, sensors developed through such methods typically involve complex preparation processes, high costs, and difficulty in biodegradation, which limit their further development. This article introduces a new flexible inductive contact force sensor using paper as a sensitive element. Paper inherently possesses micro- and nanostructures on its surface and interior, enabling it to sensitively convert changes in contact force into changes in displacement, making it suitable for use as the sensor’s sensitive element. Additionally, the advantages of paper also include its great flexibility, low cost, wide availability, and biodegradability. Performance testing on this flexible sensor showed good repeatability, hysteresis, sensitivity, and consistency. When used in experiments for monitoring human motion and respiration, this sensor also exhibited great detection performance. The proposed inductive paper-based flexible contact force sensor, with its simple structure, easy manufacturing process, cost-effectiveness, eco-friendliness, and good sensing performance, provides new insights into research for contact force sensors.
20
Wang, Dandi. "A review of flexible wearable sensors." Applied and Computational Engineering 4, no. 1 (June 14, 2023): 657–65. http://dx.doi.org/10.54254/2755-2721/4/2023373.
Full textAbstract:
With the improvement of science and technology, wearable sensor technology has been widely used in health management, human-computer interaction and many other fields, becoming a mainstream research direction. Moreover, it has a good application prospect in various industries. In this paper, the performance requirements of wearable sensors are analyzed, and the future direction of wearable sensors is discussed in combination with the development of polymer for flexible sensors on flexible substrates and conductive materials. Based on the limitations of current technology, the optimization of wearable sensor technology mainly focuses on the improvement of sensing element materials and the accuracy of collected signals.
21
Osswald, Elena, Helder Carvalho, Isabel Cabral, António Pedro Souto, and Ana Cunha. "Flexible Textile Printed Piezoresistive Pressure Sensors." Solid State Phenomena 333 (June 10, 2022): 143–51. http://dx.doi.org/10.4028/p-m88hj3.
Full textAbstract:
The combination of sensor technology and textiles substantially extends the range of textile applications. Smart textiles, especially clothing, might increasingly be equipped with pressure sensors. They could be used in the sports or health sector to measure body activities or other activities which are close to the body. Therefore, it is essential to develop flexible sensors which allow to adapt to the properties of textile materials which are in contact with the body or surrounding it. In this paper a pressure sensor based on piezoresistive ink and conductive fabric with high flexibility is reported. Preliminary pressure sensors have been fabricated and tested on a universal testing machine. The sensors show to be functional, but also showing some aspects to improve, such as its hysteretic behaviour.
22
Bu, Yingxuan, Jian Wu, Zheming Zhang, Qiandiao Wei, Benlong Su, and Youshan Wang. "Design and Analysis of Porous Elastomeric Polymer Based on Electro-Mechanical Coupling Characteristics for Flexible Pressure Sensor." Polymers 16, no. 5 (March 4, 2024): 701. http://dx.doi.org/10.3390/polym16050701.
Full textAbstract:
Elastomeric polymers have gained significant attention in the field of flexible electronics. The investigation of the electro-mechanical response relationship between polymer structure and flexible electronics is in increasing demand. This study investigated the factors that affect the performance of flexible capacitive pressure sensors using the finite element method (FEM). The sensor employed a porous elastomeric polymer as the dielectric layer. The results indicate that the sensor’s performance was influenced by both the structural and material characteristics of the porous elastomeric polymer. In terms of structural characteristics, porosity was the primary factor influencing the performance of sensors. At a porosity of 76%, the sensitivity was 42 times higher than at a porosity of 1%. In terms of material properties, Young’s modulus played a crucial role in influencing the performance of the sensors. In particular, the influence on the sensor became more pronounced when Young’s modulus was less than 1 MPa. Furthermore, porous polydimethylsiloxane (PDMS) with porosities of 34%, 47%, 67%, and 72% was fabricated as the dielectric layer for the sensor using the thermal expansion microsphere method, followed by sensing capability testing. The results indicate that the sensor’s sensitivity was noticeably influenced within the high porosity range, aligning with the trend observed in the simulation.
23
Su, Xingjie, Chunli Luo, Weiguo Yan, Junyi Jiao, and Dongzhou Zhong. "Microdome-Tunable Graphene/Carbon Nanotubes Pressure Sensors Based on Polystyrene Array for Wearable Electronics." Materials 14, no. 23 (December 2, 2021): 7385. http://dx.doi.org/10.3390/ma14237385.
Full textAbstract:
Resistive pressure sensors are appealing due to having several advantages, such as simple reading mechanisms, simple construction, and quick dynamic response. Achieving a constantly changeable microstructure of sensing materials is critical for the flexible pressure sensor and remains a difficulty. Herein, a flexible, tunable resistive pressure sensors is developed via simple, low-cost microsphere self-assembly and graphene/carbon nanotubes (CNTs) solution drop coating. The sensor uses polystyrene (PS) microspheres to construct an interlocked dome microstructure with graphene/CNTs as a conductive filler. The results indicate that the interlocked microdome-type pressure sensor has better sensitivity than the single microdome-type and single planar-type without surface microstructure. The pressure sensor’s sensitivity can be adjusted by varying the diameter of PS microspheres. In addition, the resistance of the sensor is also tunable by adjusting the number of graphene/CNT conductive coating layers. The developed flexible pressure sensor effectively detected human finger bending, demonstrating tremendous potential in human motion monitoring.
24
Takei, Kuniharu. "(Invited, Digital Presentation) Heterogeneously Integrated Nanomaterial-Based Multimodal Flexible Sensor Sheets." ECS Meeting Abstracts MA2022-01, no. 10 (July 7, 2022): 798. http://dx.doi.org/10.1149/ma2022-0110798mtgabs.
Full textAbstract:
Human interaction is of great interests for a next class of human society to realize convenient, comfortable, and safe life. For this purpose, multimodal sensing is one of the most important functionalities. Furthermore, without sacrificing the original shape change or uncomfortability to attach or wear the sensor systems onto the targeted surface, respectively, ultrathin and mechanically flexible sensor is required. To address these requirements together, one potential material system is inorganic nanomaterials, which allows it to achieve a variety of material integrated formation on a film and mechanical flexibility due to ultra-small dimensions with high performance. However, the challenges to utilize the nanomaterials for the practical flexible device applications are still remained such as scalability, long-time stability, and multi-functional integrations. In my group, we are trying to develop the heterogeneously integrated nanomaterial-based sensors on flexible films to overcome all challenges to move forward to building the new sensor platforms. In this talk, as the progress on our research activity to contribute the flexible sensor community and IoT applications, multimodal flexible sensors using mainly nanomaterials formed by solution-based and laser-induced methods are discussed for wearable healthcare/medical applications. In addition to the flexible sensors, wireless system and signal processing for the feedback alarm function when the abnormal signal is detected are introduced as the potential flexible sensor application. In particular, electrocardiogram (ECG), skin temperature, and skin humidity flexible sensors and their integration on a flexible film are explained by using fundamental characteristics. This study focuses on the heterogeneously integrated multimodal flexible sensors for the application of remote healthcare applications. Although additional functional sensors and systems to realize more useful and convenient home-use healthcare system is required, the approaches may contribute the further developments to open a next class of electronics for IoT.
25
Chen, Jinkai, Wenbo Wang, Weipeng Xuan, Xiaozhi Wang, Shurong Dong, Sean Garner, Pat Cimo, and Jikui Luo. "Flexible surface acoustic wave broadband strain sensors based on ultra-thin flexible glass substrate." MRS Advances 1, no. 21 (2016): 1519–24. http://dx.doi.org/10.1557/adv.2016.110.
Full textAbstract:
ABSTRACTFlexible SAW devices based on ZnO piezoelectric thin film deposited on ultra-thin flexible glass were fabricated and their performances as a strain sensor have been investigated. The XRD and AFM characterizations showed that the ZnO layers have good crystal quality and smooth surface. The flexible SAW devices show excellent strain sensitivity which increases from ∼87 to ∼137 Hz/με with the increasing ZnO thickness, and the sensors can withstand strains up to ∼3000 με, 4∼6 times larger than those of SAW strain sensors on rigid substrates. The sensors exhibited remarkable stability up to hundreds of times bending under large strains. The effects of environmental variables (temperature, humidity, UV light) on the sensor performance have been investigated. The temperature has a significant effect on the performance of the SAW strain sensor, while humidity and light have limited effect.
26
Ren, Haoliang. "Material basis and development prospects of nano-flexible sensors." Journal of Physics: Conference Series 2608, no. 1 (October 1, 2023): 012002. http://dx.doi.org/10.1088/1742-6596/2608/1/012002.
Full textAbstract:
Abstract The combination of nanosensors and flexible sensors gives modern sensors an important adaptive capability. Nanomaterials such as nanocellulose and carbon nanotubes have been successfully used for flexible sensors. Nanocellulose can be used as a good fibrous backbone or as a thin film. The nitrocellulose skeleton can be filled with conductive substances, and if the external losses are high, self-healing materials can be added appropriately. Carbon nanotubes have excellent electrical conductivity and performance stability, but also have certain characteristics of flexible and active materials, which can effectively improve the corresponding range and response sensitivity of flexible sensors. The correct use of these materials in the process can also reduce the use of the sensor loss. In this paper, the principle of nano-flexible sensors and the analysis of current products are illustrated by examples. And by analyzing successful experiments or showing the results of current applications of nanomaterials in flexible sensors. This paper focuses on how nanomaterials can be successfully applied to flexible sensors.
27
Gan, Tiantian. "Capacitive Flexible Pressure Sensors and Their Application." E3S Web of Conferences 553 (2024): 05038. http://dx.doi.org/10.1051/e3sconf/202455305038.
Full textAbstract:
Because of their importance in obtaining information from people and automatic equipment, flexible pressure sensors (FPS) have been widely used in diverse fields such as electronic skin, soft robots, consumer electronics, health monitoring, and human-computer interaction. Among all kinds of soft pressure sensors, capacitance pressure sensor is characterized by its simple construction, low cost, and stable performance. Although this type of pressure sensor is easily made, it is still a hotspot to increase the sensitivity and extend the efficiency of the system. This paper reviews the related research on flexible capacitive pressure sensors, including working mechanism, capacitor structures, methods to improve the performance of capacitive sensors, and applications. Finally, a comparison is made between the efficient approaches for achieving high-sensitivity, and the developing tendency of flexible capacitance sensor is predicted.The purpose of this thesis is to offer some useful information for the study of highly sensitive and highly sensitive materials for manufacturing flexible capacitive sensors.
28
Yuan, Hengyi, Yi Li, Zhihui Qian, Lei Ren, and Luquan Ren. "A Piezoresistive Sensor with High Sensitivity and Flexibility Based on Porous Sponge." Nanomaterials 12, no. 21 (October 30, 2022): 3833. http://dx.doi.org/10.3390/nano12213833.
Full textAbstract:
Chemical plating has recently been employed for the preparation of flexible piezoresistive sensors; however, plating solutions and processes that affect the sensitivity still need further exploration. In the study, a sponge-based flexible sensor with copper as its conductive material is prepared using electroless plating. The variation in sponge resistance and sensitivity changes with different plating times are studied. It is found that, with the increasing plating time, the conductivity increases and the resistance of sample will decrease. Moreover, the range of resistance difference will decrease under compression, thus the sensitivity decreases. Furthermore, the sensor’s applications were assessed, verifying the practicability of the developed preparation method. This study may bring ideas for the new development of flexible pressure sensors.
29
Zhang, Junshu, Ke Gao, Shun Weng, and Hongping Zhu. "Graphene Nanoplatelets/Polydimethylsiloxane Flexible Strain Sensor with Improved Sandwich Structure." Sensors 24, no. 9 (April 30, 2024): 2856. http://dx.doi.org/10.3390/s24092856.
Full textAbstract:
In engineering measurements, metal foil strain gauges suffer from a limited range and low sensitivity, necessitating the development of flexible sensors to fill the gap. This paper presents a flexible, high-performance piezoresistive sensor using a composite consisting of graphene nanoplatelets (GNPs) and polydimethylsiloxane (PDMS). The proposed sensor demonstrated a significantly wider range (97%) and higher gauge factor (GF) (6.3), effectively addressing the shortcomings of traditional strain gauges. The microstructure of the GNPs/PDMS composite was observed using a scanning electron microscope, and the distribution of the conductive network was analyzed. The mechanical behavior of the sensor encapsulation was analyzed, leading to the determination of the mechanisms influencing encapsulation. Experiments based on a standard equal-strength beam were conducted to investigate the influence of the base and coating dimensions of the sensor. The results indicated that reducing the base thickness and increasing the coating length both contributed to the enhancement of the sensor’s performance. These findings provide valuable guidance for future development and design of flexible sensors.
30
Kurnaz, Sedat, Ozgür Ozturk, Ali Hazar Mehmet, Utku Guduloglu, Nurdane Yilmaz, and Osman Cicek. "Flexible capacitive and piezoresistive pressure sensors based on screen-printed parylene C/polyurethane composites in low-pressure range." Flexible and Printed Electronics 8, no. 3 (September 1, 2023): 035015. http://dx.doi.org/10.1088/2058-8585/acf774.
Full textAbstract:
Abstract The use of polymers to fabricate flexible pressure sensors as an alternative to conventional pressure sensors has led to the development of physiological monitoring of human body and the electronic skin. In particular, the fabrication of flexible capacitive and piezoresistive sensors using a variety of materials and the investigation of their electromechanical properties are further developments in these fields. Herein, parylene C is synthesized via chemical vapor deposition method. Pressure-sensitive inks are prepared with a composite of parylene C, polyurethane, polymethylmethacrylate, and activated carbon at certain weight ratios. Flexible capacitive and piezoresistive pressure sensors are fabricated by the screen printing method. The sensitivity, detection limit, linearity range, and response/relaxation time, which define the capacitive and piezoresistive properties are investigated and presented in this paper. The sensitivities of the flexible capacitive and piezoresistive pressure sensors are 0.124 kPa−1 and 0.074 kPa−1 in the pressure range of 0.07–1.39 kPa. This study enables parylene C to be used in the composite structure and shows that it can be used not only as a protective layer but also in flexible pressure sensor applications. It also ensures that the design of the flexible capacitance pressure sensor can measure low pressure with high sensitivity compared to the flexible piezoresistive pressure sensor.
31
Yin, Yunlei, Cheng Guo, Hong Li, Hongying Yang, Fan Xiong, and Dongyi Chen. "The Progress of Research into Flexible Sensors in the Field of Smart Wearables." Sensors 22, no. 14 (July 6, 2022): 5089. http://dx.doi.org/10.3390/s22145089.
Full textAbstract:
In modern society, technology associated with smart sensors made from flexible materials is rapidly evolving. As a core component in the field of wearable smart devices (or ‘smart wearables’), flexible sensors have the advantages of excellent flexibility, ductility, free folding properties, and more. When choosing materials for the development of sensors, reduced weight, elasticity, and wearer’s convenience are considered as advantages, and are suitable for electronic skin, monitoring of health-related issues, biomedicine, human–computer interactions, and other fields of biotechnology. The idea behind wearable sensory devices is to enable their easy integration into everyday life. This review discusses the concepts of sensory mechanism, detected object, and contact form of flexible sensors, and expounds the preparation materials and their applicability. This is with the purpose of providing a reference for the further development of flexible sensors suitable for wearable devices.
32
Yang, Zetian, Zhongtai Zhu, Zixuan Chen, Mingjia Liu, Binbin Zhao, Yansong Liu, Zefei Cheng, Shuo Wang, Weidong Yang, and Tao Yu. "Recent Advances in Self-Powered Piezoelectric and Triboelectric Sensors: From Material and Structure Design to Frontier Applications of Artificial Intelligence." Sensors 21, no. 24 (December 17, 2021): 8422. http://dx.doi.org/10.3390/s21248422.
Full textAbstract:
The development of artificial intelligence and the Internet of things has motivated extensive research on self-powered flexible sensors. The conventional sensor must be powered by a battery device, while innovative self-powered sensors can provide power for the sensing device. Self-powered flexible sensors can have higher mobility, wider distribution, and even wireless operation, while solving the problem of the limited life of the battery so that it can be continuously operated and widely utilized. In recent years, the studies on piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators (TENGs) have mainly concentrated on self-powered flexible sensors. Self-powered flexible sensors based on PENGs and TENGs have been reported as sensing devices in many application fields, such as human health monitoring, environmental monitoring, wearable devices, electronic skin, human–machine interfaces, robots, and intelligent transportation and cities. This review summarizes the development process of the sensor in terms of material design and structural optimization, as well as introduces its frontier applications in related fields. We also look forward to the development prospects and future of self-powered flexible sensors.
33
Wang, Qi, Jianjun Cui, Yanhong Tang, Liang Pang, Kai Chen, and Baowu Zhang. "Research on a Precision Calibration Model of a Flexible Strain Sensor Based on a Variable Section Cantilever Beam." Sensors 23, no. 10 (May 16, 2023): 4778. http://dx.doi.org/10.3390/s23104778.
Full textAbstract:
The flexible strain sensor’s measuring range is usually over 5000 με, while the conventional variable section cantilever calibration model has a measuring range within 1000 με. In order to satisfy the calibration requirements of flexible strain sensors, a new measurement model was proposed to solve the inaccurate calculation problem of the theoretical strain value when the linear model of a variable section cantilever beam was applied to a large range. The nonlinear relationship between deflection and strain was established. The finite element analysis of a variable section cantilever beam with ANSYS shows that the linear model’s relative deviation is as high as 6% at 5000 με, while the relative deviation of the nonlinear model is only 0.2%. The relative expansion uncertainty of the flexible resistance strain sensor is 0.365% (k = 2). Simulation and experimental results show that this method solves the imprecision of the theoretical model effectively and realizes the accurate calibration of a large range of strain sensors. The research results enrich the measurement models and calibration models for flexible strain sensors and contribute to the development of strain metering.
34
Nyabadza, Anesu, Mercedes Vázquez, Shirley Coyle, Brian Fitzpatrick, and Dermot Brabazon. "Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical and Chemical Property Sensors." Applied Sciences 11, no. 18 (September 15, 2021): 8563. http://dx.doi.org/10.3390/app11188563.
Full textAbstract:
The use of flexible sensors has tripled over the last decade due to the increased demand in various fields including health monitoring, food packaging, electronic skins and soft robotics. Flexible sensors have the ability to be bent and stretched during use and can still maintain their electrical and mechanical properties. This gives them an advantage over rigid sensors that lose their sensitivity when subject to bending. Advancements in 3D printing have enabled the development of tailored flexible sensors. Various additive manufacturing methods are being used to develop these sensors including inkjet printing, aerosol jet printing, fused deposition modelling, direct ink writing, selective laser melting and others. Hydrogels have gained much attention in the literature due to their self-healing and shape transforming. Self-healing enables the sensor to recover from damages such as cracks and cuts incurred during use, and this enables the sensor to have a longer operating life and stability. Various polymers are used as substrates on which the sensing material is placed. Polymers including polydimethylsiloxane, Poly(N-isopropylacrylamide) and polyvinyl acetate are extensively used in flexible sensors. The most widely used nanomaterials in flexible sensors are carbon and silver due to their excellent electrical properties. This review gives an overview of various types of flexible sensors (including temperature, pressure and chemical sensors), paying particular attention to the application areas and the corresponding characteristics/properties of interest required for such. Current advances/trends in the field including 3D printing, novel nanomaterials and responsive polymers, and self-healable sensors and wearables will also be discussed in more detail.
35
Chou, Jung-Chuan, and Chien-Cheng Chen. "WEIGHTED DATA FUSION FOR FLEXIBLE pH SENSORS ARRAY." Biomedical Engineering: Applications, Basis and Communications 21, no. 06 (December 2009): 365–69. http://dx.doi.org/10.4015/s1016237209001465.
Full textAbstract:
Data fusion is a frequent statistic method that can be applied to sensor development field, such as multisensors and sensors array. In this study, the analytic data fusion methods consist of the arithmetic mean and weighted data fusion used to estimate the measured pH data of flexible pH sensors array. The main part of the flexible 2 × 4 pH sensors array was fabricated by screen printing, and the ruthenium dioxide ( RuO2 ) thin film on each sensor of the sensor array was deposited by radio frequency (RF)-sputtering method. In accordance with experiment results, the pH values estimated by weighted data fusion method are accurate than by arithmetic mean method. Furthermore, that the flexible sensors array is actually used to detect the pH value of different commercial drinks is also investigated.
36
Shir, Daniel, Zachary S. Ballard, and Aydogan Ozcan. "Flexible Plasmonic Sensors." IEEE Journal of Selected Topics in Quantum Electronics 22, no. 4 (July 2016): 12–20. http://dx.doi.org/10.1109/jstqe.2015.2507363.
Full text
37
Pan, Lili, Yali Xie, Huali Yang, Mengchao Li, Xilai Bao, Jie Shang, and Run-Wei Li. "Flexible Magnetic Sensors." Sensors 23, no. 8 (April 18, 2023): 4083. http://dx.doi.org/10.3390/s23084083.
Full textAbstract:
With the merits of high sensitivity, high stability, high flexibility, low cost, and simple manufacturing, flexible magnetic field sensors have potential applications in various fields such as geomagnetosensitive E-Skins, magnetoelectric compass, and non-contact interactive platforms. Based on the principles of various magnetic field sensors, this paper introduces the research progress of flexible magnetic field sensors, including the preparation, performance, related applications, etc. In addition, the prospects of flexible magnetic field sensors and their challenges are presented.
38
Heo, Jin Seok, Jong Ha Cheung, and Jung Ju Lee. "Flexible Force Sensors Using Fiber Bragg Grating." Key Engineering Materials 326-328 (December 2006): 1343–46. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1343.
Full textAbstract:
In this paper, we present a newly designed flexible optical fiber force sensors which use fiber Bragg gratings and diaphragm and bridge type transducer, to detect a distributed normal force and which is the first step toward realizing a tactile sensor using optical fiber sensors (FBG). The transducer is designed such that it is not affected by chirping and light loss to enhance the performance of the sensors. We also present the design and fabrication process and experimental verification of the prototype sensors.
39
Liu, Xu, Yuan Wei, and Yuanying Qiu. "Advanced Flexible Skin-Like Pressure and Strain Sensors for Human Health Monitoring." Micromachines 12, no. 6 (June 14, 2021): 695. http://dx.doi.org/10.3390/mi12060695.
Full textAbstract:
Recently, owing to their excellent flexibility and adaptability, skin-like pressure and strain sensors integrated with the human body have the potential for great prospects in healthcare. This review mainly focuses on the representative advances of the flexible pressure and strain sensors for health monitoring in recent years. The review consists of five sections. Firstly, we give a brief introduction of flexible skin-like sensors and their primary demands, and we comprehensively outline the two categories of design strategies for flexible sensors. Secondly, combining the typical sensor structures and their applications in human body monitoring, we summarize the recent development of flexible pressure sensors based on perceptual mechanism, the sensing component, elastic substrate, sensitivity and detection range. Thirdly, the main structure principles and performance characteristic parameters of noteworthy flexible strain sensors are summed up, namely the sensing mechanism, sensitive element, substrate, gauge factor, stretchability, and representative applications for human monitoring. Furthermore, the representations of flexible sensors with the favorable biocompatibility and self-driven properties are introduced. Finally, in conclusion, besides continuously researching how to enhance the flexibility and sensitivity of flexible sensors, their biocompatibility, versatility and durability should also be given sufficient attention, especially for implantable bioelectronics. In addition, the discussion emphasizes the challenges and opportunities of the above highlighted characteristics of novel flexible skin-like sensors.
40
Dean, Robert N., Michael C. Hamilton, and Michael E. Baginski. "Capacitive Fringing Field Moisture Sensors Implemented in Flexible Printed Circuit Board Technology." Journal of Microelectronics and Electronic Packaging 11, no. 3 (July 1, 2014): 122–27. http://dx.doi.org/10.4071/imaps.415.
Full textAbstract:
Capacitive fringing field sensors are often used in applications where moisture is detected, since the dielectric constant of liquid water is approximately 80 times greater than the dielectric constant of air. Most of these sensors, however, are realized using rigid substrates. Some applications would benefit from using a flexible capacitive fringing field sensor that could be conformally mounted on a nonplanar surface. Flexible printed circuit board technology is a mature commercially available process for manufacturing flexible electronics. This same technology can also be used to realize flexible fringing field moisture sensors where the patterned Cu foil is used for the electrodes and the soldermask coating electrically insulates the electrodes from being electrically shorted by moisture in the detection environment. Sensors were designed and characterized through flat and bending tests in air and in water. The tests demonstrated that bending a sensor over a radius of curvature as small as 13.7 mm had no measurable impact on sensor performance in air or in water. The sensors achieved a 3:1 increase in capacitance when immersed in water compared with in air.
41
Lin, Xingtong, and Junze She. "Resistive Flexible Pressure Sensors and Their Applications." Highlights in Science, Engineering and Technology 44 (April 13, 2023): 61–66. http://dx.doi.org/10.54097/hset.v44i.7196.
Full textAbstract:
Resistive flexible sensors are widely used in many fields. Especially now, resistive flexible sensors are making great contributions to the development of wearable sensors and artificial intelligence. Therefore, the current situation in this article studies the resistive flexible sensor. This article will first introduce the background of the research, and then elaborate on sensing mechanism, the sensing improvement strategy, materials of dielectric composite, and had a great discussion in detail. The research significance of this article is to provide ideas and some summaries of the current situation for future research accuracy. Therefore, the research in this paper will be of great value to the application and research of wearable and more accurate treatment and diagnosis of future patients with the help of resistive flexible sensors. It is worth mentioning that the working principle and The sensitivity improvement strategy of this kind of sensor are introduced in detail in the following paper, and the physical and chemical properties of the raw materials of the flexible sensor are well analyzed, and then in-depth discussion is carried out. It provides some feasible ideas for improving performance.
42
Wang, Yan, Ben Yang, Zhekun Hua, Junyao Zhang, Pu Guo, Dandan Hao, Yushan Gao, and Jia Huang. "Recent advancements in flexible and wearable sensors for biomedical and healthcare applications." Journal of Physics D: Applied Physics 55, no. 13 (December 29, 2021): 134001. http://dx.doi.org/10.1088/1361-6463/ac3c73.
Full textAbstract:
Abstract With the increasing awareness of personal health management in recent decades, various types of flexible and wearable body sensors have been developed. Thanks to the superiority of advanced wearable technologies, including miniaturization, portability, stretchability, comfort, intelligent human-machine interface, etc, flexible and wearable body sensors hold great promise for next generation biomedicine and healthcare applications. Unfortunately, the data precision, response speed, sensitivity and selectivity, durability, compatibility with flexible substrates, and preparation techniques still need to be enhanced and refined to meet the requirements of clinical evaluations or even commercialization. According to working principles, flexible and wearable sensing platforms can be roughly divided into four categories: physical sensors, chemical sensors, biosensors, and the combination of different types of sensors. Here, a brief review focused on the recent developments of these flexible and wearable sensors applied especially to biomedicine and healthcare is presented. In addition, the existing challenges and potential opportunities ahead in flexible and wearable sensor technologies are discussed. Finally, an outlook of wearable sensing platforms in biomedicine and healthcare is proposed. We hope this review can provide guidance for superior flexible and wearable sensing technologies in the future and can provide an outlook for commercial wearable sensors.
43
Costa, Júlio C., Filippo Spina, Pasindu Lugoda, Leonardo Garcia-Garcia, Daniel Roggen, and Niko Münzenrieder. "Flexible Sensors—From Materials to Applications." Technologies 7, no. 2 (April 9, 2019): 35. http://dx.doi.org/10.3390/technologies7020035.
Full textAbstract:
Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.
44
Lai, Qin-Teng, Qi-Jun Sun, Zhenhua Tang, Xin-Gui Tang, and Xin-Hua Zhao. "Conjugated Polymer-Based Nanocomposites for Pressure Sensors." Molecules 28, no. 4 (February 8, 2023): 1627. http://dx.doi.org/10.3390/molecules28041627.
Full textAbstract:
Flexible sensors are the essential foundations of pressure sensing, microcomputer sensing systems, and wearable devices. The flexible tactile sensor can sense stimuli by converting external forces into electrical signals. The electrical signals are transmitted to a computer processing system for analysis, realizing real-time health monitoring and human motion detection. According to the working mechanism, tactile sensors are mainly divided into four types—piezoresistive, capacitive, piezoelectric, and triboelectric tactile sensors. Conventional silicon-based tactile sensors are often inadequate for flexible electronics due to their limited mechanical flexibility. In comparison, polymeric nanocomposites are flexible and stretchable, which makes them excellent candidates for flexible and wearable tactile sensors. Among the promising polymers, conjugated polymers (CPs), due to their unique chemical structures and electronic properties that contribute to their high electrical and mechanical conductivity, show great potential for flexible sensors and wearable devices. In this paper, we first introduce the parameters of pressure sensors. Then, we describe the operating principles of resistive, capacitive, piezoelectric, and triboelectric sensors, and review the pressure sensors based on conjugated polymer nanocomposites that were reported in recent years. After that, we introduce the performance characteristics of flexible sensors, regarding their applications in healthcare, human motion monitoring, electronic skin, wearable devices, and artificial intelligence. In addition, we summarize and compare the performances of conjugated polymer nanocomposite-based pressure sensors that were reported in recent years. Finally, we summarize the challenges and future directions of conjugated polymer nanocomposite-based sensors.
45
Yang, Hanxiong. "Recent progress of wearable and implantable sensors for mobile health." Highlights in Science, Engineering and Technology 63 (August 8, 2023): 1–8. http://dx.doi.org/10.54097/hset.v63i.10781.
Full textAbstract:
With the multidisciplinary development of biomedicine, materials science, control science, and communication technology, the wearable devices market is developing rapidly. Flexible sensors are a core component of wearable devices. From monitoring to preventing diseases and being used in clinical trials to improve medical outcomes, the applications of sensors in the medical field are rapidly expanding. This paper will discuss some of the new medical applications of flexible sensor devices and summarise the progress in advanced medical research and development potential of the devices. Firstly, the paper discusses an overview of background information on wearable devices and sensors. This is followed by an overview of the materials used to manufacture flexible sensors. These are polymers, carbon-based materials, and hydrogels. Then, it compared the unique advantages of flexible sensors in terms of two modes which include in-vivo sensing and in-vitro sensing. Finally, the paper presents the current opportunities and possible future challenges for the sensor market.
46
Yang, Hongwei. "Wearable Flexible Temperature Sensors and Their Applications." Highlights in Science, Engineering and Technology 102 (July 11, 2024): 124–28. http://dx.doi.org/10.54097/r6b57895.
Full textAbstract:
Wearable flexible temperature sensors, as a new type of sensor technology, have the ability to monitor the surface temperature of human skin in real-time. Compared with traditional temperature sensors, wearable and flexible temperature sensors have the advantages of comfort, wearability, and strong adaptability, which can provide new solutions for medical monitoring, health monitoring, and sports training. The basic principle is based on the thermoelectric effect or thermistor effect. Specifically, temperature sensors convert thermal energy into electrical signals by measuring the temperature changes of an object. Based on the magnitude of electrical signals caused by temperature changes, the temperature of an object can be inferred. Using flexible materials as the substrate for sensors, temperature measurement is achieved by measuring the material's resistance, capacitance, or thermal conductivity. The preparation methods mainly include the selection of flexible materials, the preparation of sensing elements, and the integration of sensors. Common flexible materials include polymers, nanomaterials, and conductive fibers. This article reviews the research progress of wearable temperature sensors in recent years, including wearable optical temperature sensors, wearable temperature sensors for clinical detection, integrated wireless sensors, multi-mode force and temperature tactile sensors based on high sensitivity short channels, and other advanced temperature sensors. Finally, the challenges and future development directions of flexible wearable temperature sensors were proposed. Sensors, as one of the most important core components, will affect the functional design and future development direction of wearable devices. That's why it has been highly anticipated in recent years.
47
Chen, Wufan, Bingwei Wang, Qianbing Zhu, and Xin Yan. "Flexible Pressure Sensors with a Wide Detection Range Based on Self-Assembled Polystyrene Microspheres." Sensors 19, no. 23 (November 27, 2019): 5194. http://dx.doi.org/10.3390/s19235194.
Full textAbstract:
Flexible pressure sensors are important components of electronic skin and flexible wearable devices. Most existing piezoresistive flexible pressure sensors have obtained high sensitivities, however, they have relatively small pressure detection ranges. Here, we report flexible pressure sensors with a wide detection range using polydimethylsiloxane (PDMS) as the substrate, carbon nanotube films as the electrode material, and self-assembled polystyrene microsphere film as the microstructure layer. The obtained pressure sensor had a sandwich structure, and had a wide pressure detection range (from 4 kPa to 270 kPa), a sensitivity of 2.49 kPa−1, and a response time of tens of milliseconds. Two hundred load–unload cycles indicated that the device had good stability. In addition, the sensor was obtained by large-area fabrication with a low power consumption. This pressure sensor is expected to be widely used in applications such as electronic skin and flexible wearable devices.
48
Zabihi, Mehdi, Bhawya, Parikshit Pandya, Brooke R. Shepley, Nicholas J. Lester, Syed Anees, Anthony R. Bain, Simon Rondeau-Gagné, and Mohammed Jalal Ahamed. "Inertial and Flexible Resistive Sensor Data Fusion for Wearable Breath Recognition." Applied Sciences 14, no. 7 (March 28, 2024): 2842. http://dx.doi.org/10.3390/app14072842.
Full textAbstract:
This paper proposes a novel data fusion technique for a wearable multi-sensory patch that integrates an accelerometer and a flexible resistive pressure sensor to accurately capture breathing patterns. It utilizes an accelerometer to detect breathing-related diaphragmatic motion and other body movements, and a flex sensor for muscle stretch detection. The proposed sensor data fusion technique combines inertial and pressure sensors to eliminate nonbreathing body motion-related artifacts, ensuring that the filtered signal exclusively conveys information pertaining to breathing. The fusion technique mitigates the limitations of relying solely on one sensor’s data, providing a more robust and reliable solution for continuous breath monitoring in clinical and home environments. The sensing system was tested against gold-standard spirometry data from multiple participants for various breathing patterns. Experimental results demonstrate the effectiveness of the proposed approach in accurately monitoring breathing rates, even in the presence of nonbreathing-related body motion. The results also demonstrate that the multi-sensor patch presented in this paper can accurately distinguish between varying breathing patterns both at rest and during body movements.
49
Zhang, Juan, Yanen Wang, Qinghua Wei, Yanmei Wang, Mingju Lei, Mingyang Li, Dinghao Li, Longyu Zhang, and Yu Wu. "Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review." Gels 7, no. 4 (November 16, 2021): 216. http://dx.doi.org/10.3390/gels7040216.
Full textAbstract:
Sensors are devices that can capture changes in environmental parameters and convert them into electrical signals to output, which are widely used in all aspects of life. Flexible sensors, sensors made of flexible materials, not only overcome the limitations of the environment on detection devices but also expand the application of sensors in human health and biomedicine. Conductivity and flexibility are the most important parameters for flexible sensors, and hydrogels are currently considered to be an ideal matrix material due to their excellent flexibility and biocompatibility. In particular, compared with flexible sensors based on elastomers with a high modulus, the hydrogel sensor has better stretchability and can be tightly attached to the surface of objects. However, for hydrogel sensors, a poor mechanical lifetime is always an issue. To address this challenge, a self-healing hydrogel has been proposed. Currently, a large number of studies on the self-healing property have been performed, and numerous exciting results have been obtained, but there are few detailed reviews focusing on the self-healing mechanism and conductivity of hydrogel flexible sensors. This paper presents an overview of self-healing hydrogel flexible sensors, focusing on their self-healing mechanism and conductivity. Moreover, the advantages and disadvantages of different types of sensors have been summarized and discussed. Finally, the key issues and challenges for self-healing flexible sensors are also identified and discussed along with recommendations for the future.
50
Yuan, Yingying, Bo Liu, Hui Li, Mo Li, Yingqiu Song, Runze Wang, Tianlu Wang, and Hangyu Zhang. "Flexible Wearable Sensors in Medical Monitoring." Biosensors 12, no. 12 (November 23, 2022): 1069. http://dx.doi.org/10.3390/bios12121069.
Full textAbstract:
The popularity of health concepts and the wave of digitalization have driven the innovation of sensors in the medical field. Such continual development has made sensors progress in the direction of safety, flexibility, and intelligence for continuous monitoring of vital signs, which holds considerable promise for changing the way humans live and even treat diseases. To this end, flexible wearable devices with high performance, such as high sensitivity, high stability, and excellent biodegradability, have attracted strong interest from scientists. Herein, a review of flexible wearable sensors for temperature, heart rate, human motion, respiratory rate, glucose, and pH is highlighted. In addition, engineering issues are also presented, focusing on material selection, sensor fabrication, and power supply. Finally, potential challenges facing current technology and future directions of wearable sensors are also discussed.