Journal articles: 'Nanomaterials - Gas Sensing'

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Yadav, Anshul, and Niraj Sinha. "Nanomaterial-based gas sensors: A review on experimental and theoretical studies." Materials Express 12, no. 1 (January 1, 2022): 1–33. http://dx.doi.org/10.1166/mex.2022.2121.

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Gas sensors play an essential role in various fields such as public safety, environmental monitoring, medical engineering, food monitoring, pharmaceutical industries and clinical diagnostic, to name a few. The need for miniaturized sensors possessing high sensitivity, time response, selectivity, reproducibility, durability, and low cost has driven the discovery of nanomaterials-based gas sensing devices due to their inherent properties such as chemical/physical gas adsorption capabilities and high surface-to-volume ratio. Studies in the literature highlight the development of gas sensors using novel nanomaterials to detect toxic gases. The gas molecules are sensed by the nanomaterial due to adsorption of the gas on the sensor surface, which leads to conductivity change in the nanomaterial. However, the sensing mechanism is quite complicated. Computational studies help the researchers elucidate the physical understanding behind such a complicated mechanism and aid in developing tailored nanomaterials for gas sensing applications. This review outlines different sensor types and the advantages and disadvantages of each sensor for various applications. Different nanostructure-based gas sensors and recent studies are discussed elaborately. The contributions made by theoretical and experimental studies in studying the gas sensing applications of nanomaterials are also discussed.

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Zhong, Zhi-Cheng, Zhao-Jun Jing, Kui-Yuan Liu, and Tong Liu. "Acetylene Sensing by ZnO/TiO2 Nanoparticles." Journal of Nanoelectronics and Optoelectronics 15, no. 1 (January 1, 2020): 41–45. http://dx.doi.org/10.1166/jno.2020.2726.

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We adopted the sol–gel and hydrothermal methods to prepare the TiO2 nanomaterials doped with ZnO. We adopted X-ray diffraction, scanning electron microscopy, and the Brunauer–Emmett–Teller method to investigate the materials’ structures and morphologies. The results showed that the prepared TiO2 nanomaterials had uniform size and good dispersibility. Gas sensors were fabricated and their performances in acetylene sensing were assessed. The results show that the sensor prepared with the ZnO/TiO2 nanomaterial doped with 10 wt% ZnO gave fast response and recovery times for acetylene gas at different concentrations. When the operating temperature was 280 °C, the gas sensor detected 200 ppm acetylene gas with a response sensitivity of 9.9, a response time of 5 s, and a recovery time of 2 s.

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Bogue, Robert. "Nanomaterials for gas sensing: a review of recent research." Sensor Review 34, no. 1 (January 14, 2014): 1–8. http://dx.doi.org/10.1108/sr-03-2013-637.

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Purpose – This paper aims to provide a detailed review of gas sensor research which exploits the properties of nanomaterials and nanostructures. Design/methodology/approach – Following an introduction, this paper discusses developments in gas sensors based on carbon nanotubes, titanium dioxide nanotubes, graphene, nanocrystalline diamond and a range of metal oxide nanomaterials. It concludes with a discussion of this research and its commercial potential and a list of references to the research considered in the main text. Findings – Gas sensors based on a multitude of nanomaterials are the subject of a global research effort which has generated an extensive literature. Prototype devices have been developed which respond to numerous important gases at concentrations which correspond well with industrial requirements. Other critical performance characteristics have been studied extensively and the results suggest commercial prospects for these technologies. Originality/value – This paper provides details of the highly topical field of nanomaterial-based gas sensor research.

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Zeng, Yamei, Shiwei Lin, Ding Gu, and Xiaogan Li. "Two-Dimensional Nanomaterials for Gas Sensing Applications: The Role of Theoretical Calculations." Nanomaterials 8, no. 10 (October 19, 2018): 851. http://dx.doi.org/10.3390/nano8100851.

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Two-dimensional (2D) nanomaterials have attracted a large amount of attention regarding gas sensing applications, because of their high surface-to-volume ratio and unique chemical or physical gas adsorption capabilities. As an important research method, theoretical calculations have been massively applied in predicting the potentially excellent gas sensing properties of these 2D nanomaterials. In this review, we discuss the contributions of theoretical calculations in the study of the gas sensing properties of 2D nanomaterials. Firstly, we elaborate on the gas sensing mechanisms of 2D layered nanomaterials, such as the traditional charge transfer mechanism, and a standard for distinguishing between physical and chemical adsorption, from the perspective of theoretical calculations. Then, we describe how to conduct a theoretical analysis to explain or predict the gas sensing properties of 2D nanomaterials. Thirdly, we discuss three important methods that have been applied in order to improve the gas sensing properties, that is, defect functionalization (vacancy, edge, grain boundary, and doping), heterojunctions, and electric fields. Among these strategies, theoretical calculations play a very important role in explaining the mechanisms underlying the enhanced gas sensing properties. Finally, we summarize both the advantages and limitations of the theoretical calculations, and present perspectives for further research on the 2D nanomaterials-based gas sensors.

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Lun, Danyang, and Ke Xu. "Recent Progress in Gas Sensor Based on Nanomaterials." Micromachines 13, no. 6 (June 10, 2022): 919. http://dx.doi.org/10.3390/mi13060919.

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Nanomaterials-based gas sensors have great potential for substance detection. This paper first outlines the research of gas sensors composed of various dimensional nanomaterials. Secondly, nanomaterials may become the development direction of a new generation of gas sensors due to their high sensing efficiency, good detection capability and high sensitivity. Through their excellent characteristics, gas sensors also show high responsiveness and sensing ability, which also plays an increasingly important role in the field of electronic skin. We also reviewed the physical sensors formed from nanomaterials in terms of the methods used, the characteristics of each type of sensor, and the advantages and contributions of each study. According to the different kinds of signals they sense, we especially reviewed research on gas sensors composed of different nanomaterials. We also reviewed the different mechanisms, research processes, and advantages of the different ways of constituting gas sensors after sensing signals. According to the techniques used in each study, we reviewed the differences and advantages between traditional and modern methods in detail. We compared and analyzed the main characteristics of gas sensors with various dimensions of nanomaterials. Finally, we summarized and proposed the development direction of gas sensors based on various dimensions of nanomaterials.

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Galstyan, Vardan, Nicola Poli, and Elisabetta Comini. "Highly Sensitive and Selective H2S Chemical Sensor Based on ZnO Nanomaterial." Applied Sciences 9, no. 6 (March 19, 2019): 1167. http://dx.doi.org/10.3390/app9061167.

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ZnO is worth evaluating for chemical sensing due to its outstanding physical and chemical properties. We report the fabrication and study of the gas sensing properties of ZnO nanomaterial for the detection of hydrogen sulfide (H2S). This prepared material exhibited a 7400 gas sensing response when exposed to 30 ppm of H2S in air. In addition, the structure showed a high selectivity towards H2S against other reducing gases. The high sensing performance of the structure was attributed to its nanoscale size, morphology and the disparity in the sensing mechanism between the H2S and other reducing gases. We suggest that the work reported here including the simplicity of device fabrication is a significant step toward the application of ZnO nanomaterials in chemical gas sensing systems for the real-time detection of H2S.

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Malik, Ritu, Vijay K. Tomer, Yogendra Kumar Mishra, and Liwei Lin. "Functional gas sensing nanomaterials: A panoramic view." Applied Physics Reviews 7, no. 2 (June 2020): 021301. http://dx.doi.org/10.1063/1.5123479.

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Wang, Xiao-Feng, Xue-Zhi Song, Kai-Ming Sun, Li Cheng, and Wei Ma. "MOFs-derived porous nanomaterials for gas sensing." Polyhedron 152 (September 2018): 155–63. http://dx.doi.org/10.1016/j.poly.2018.06.037.

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Debéda, Hélène, Van Son Nguyen, Pierrick Clément, Véronique Jubera, and Eduard Llobet. "Printed transducers using nanomaterials for gas sensing." Materials Today: Proceedings 6 (2019): 306–9. http://dx.doi.org/10.1016/j.matpr.2018.10.421.

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10

Lyson-Sypien, B., A. Czapla, M. Lubecka, E. Kusior, K. Zakrzewska, M. Radecka, A. Kusior, A. G. Balogh, S. Lauterbach, and H. J. Kleebe. "Gas sensing properties of TiO2–SnO2 nanomaterials." Sensors and Actuators B: Chemical 187 (October 2013): 445–54. http://dx.doi.org/10.1016/j.snb.2013.01.047.

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Dinu, Livia Alexandra, Valentin Buiculescu, and Angela Mihaela Baracu. "Recent Progress on Nanomaterials for NO2 Surface Acoustic Wave Sensors." Nanomaterials 12, no. 12 (June 20, 2022): 2120. http://dx.doi.org/10.3390/nano12122120.

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NO2 gas surface acoustic wave (SAW)sensors are under continuous development due to their high sensitivity, reliability, low cost and room temperature operation. Their integration ability with different receptor nanomaterials assures a boost in the performance of the sensors. Among the most exploited nano-materials for sensitive detection of NO2 gas molecules are carbon-based nanomaterials, metal oxide semiconductors, quantum dots, and conducting polymers. All these nanomaterials aim to create pores for NO2 gas adsorption or to enlarge the specific surface area with ultra-small nanoparticles that increase the active sites where NO2 gas molecules can diffuse. This review provides a general overview of NO2 gas SAW sensors, with a focus on the different sensors’ configurations and their fabrication technology, on the nanomaterials used as sensitive NO2 layers and on the test methods for gas detection. The synthesis methods of sensing nanomaterials, their functionalization techniques, the mechanism of interaction between NO2 molecules and the sensing nanomaterials are presented and discussed.

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Ren, Pengyu, Qingwei Shi, and Lingling Qi. "A Gas Sensor Based on Network Nanowire for H2S Monitor in Construction Waste Landfill." Chemosensors 9, no. 7 (June 25, 2021): 156. http://dx.doi.org/10.3390/chemosensors9070156.

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As an extremely harmful gas, H2S gas is the major pollutant in construction waste landfill. Herein, a one-dimensional oxide nanomaterial was produced from a simple wet chemical method to serve as a H2S gas sensing material. The SEM observation indicates that the nanomaterial with network structure is constructed by a lot of nanowires with an approximate diameter from 24 nm to 40 nm. The sensing film was formed on a ceramic substrate using a slurry composed of the as-prepared network nanowires. Furthermore, a gas sensing measurement was carried out to determine the gas sensing performances towards the H2S gas. The detection results at different working temperature towards various gas concentrations demonstrate that the network nanowires-based sensor exhibits a higher gas response to H2S as compared to that of the rod-like one. The optimum working temperature of the network and rod-like nanomaterials is both 300 °C, and the corresponding maximum gas response is 24.4 and 13.6, respectively. Namely, the gas response of the network-based gas sensor is almost larger than that of the rod-like oxide. Moreover, the network nanowires-based gas sensor display a faster gas response and recovery speed. In addition, the fabricated gas sensors all exhibit excellent repeatability. Such improved sensing properties may offer a promising potential to realize an efficient detection of harmful H2S gas released from construction waste landfill.

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13

Vilanova, Xavier. "Special Issue “Advanced Nanomaterials Based Gas Sensors”." Sensors 20, no. 5 (March 2, 2020): 1373. http://dx.doi.org/10.3390/s20051373.

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During the last several years, according to the works published in research journals, many nanostructured materials have been tested as sensing materials for gas-sensing applications. This trend has been observed for both metal oxides as well as carbon-based nanomaterials. More recently, it has also been extended to other materials based on chalcogenides. The field of applications for these sensors is very wide, including air quality, industrial safety and medical diagnosis, using different transducing mechanisms. Therefore, in this Special Issue, we have put together recent advances in this area.

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14

Yang, Wei, Lin Gan, Huiqiao Li, and Tianyou Zhai. "Two-dimensional layered nanomaterials for gas-sensing applications." Inorganic Chemistry Frontiers 3, no. 4 (2016): 433–51. http://dx.doi.org/10.1039/c5qi00251f.

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In this critical review, we mainly focus on the current developments of gas sensors based on typical 2D layered nanomaterials, including graphene, MoS₂, MoSe₂, WS₂, SnS₂, VS₂, black phosphorus (BP), h-BN, and g-C₃N₄.

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Sahay, P. P. "Multifunctional metal oxide nanomaterials for chemical gas sensing." Procedia Engineering 215 (2017): 145–51. http://dx.doi.org/10.1016/j.proeng.2017.11.003.

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Kusior, A., J. Klich-Kafel, A. Trenczek-Zajac, K. Swierczek, M. Radecka, and K. Zakrzewska. "TiO2–SnO2 nanomaterials for gas sensing and photocatalysis." Journal of the European Ceramic Society 33, no. 12 (October 2013): 2285–90. http://dx.doi.org/10.1016/j.jeurceramsoc.2013.01.022.

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Mistry, Kissan, Khaled H. Ibrahim, Inna Novodchuk, Hyunh Thien Ngo, Gaku Imamura, Joseph Sanderson, Mustafa Yavuz, Genki Yoshikawa, and Kevin P. Musselman. "Nanomechanical Gas Sensing with Laser Treated 2D Nanomaterials." Advanced Materials Technologies 5, no. 12 (November 3, 2020): 2000704. http://dx.doi.org/10.1002/admt.202000704.

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18

Bannov, Alexander G., Maxim V. Popov, Andrei E. Brester, and Pavel B. Kurmashov. "Recent Advances in Ammonia Gas Sensors Based on Carbon Nanomaterials." Micromachines 12, no. 2 (February 12, 2021): 186. http://dx.doi.org/10.3390/mi12020186.

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This review paper is devoted to an extended analysis of ammonia gas sensors based on carbon nanomaterials. It provides a detailed comparison of various types of active materials used for the detection of ammonia, e.g., carbon nanotubes, carbon nanofibers, graphene, graphene oxide, and related materials. Different parameters that can affect the performance of chemiresistive gas sensors are discussed. The paper also gives a comparison of the sensing characteristics (response, response time, recovery time, operating temperature) of gas sensors based on carbon nanomaterials. The results of our tests on ammonia gas sensors using various techniques are analyzed. The problems related to the recovery of sensors using various approaches are also considered. Finally, the impact of relative humidity on the sensing behavior of carbon nanomaterials of various different natures was estimated.

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Xue, Shirui, Sicheng Cao, Zhaoling Huang, Daoguo Yang, and Guoqi Zhang. "Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review." Materials 14, no. 15 (July 30, 2021): 4263. http://dx.doi.org/10.3390/ma14154263.

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In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely. Metal oxide semiconductor (MOS) gas sensors have become an important area of research in the field of gas sensing due to their high sensitivity, quick response time, and short recovery time for NO2, CO2, acetone, etc. In our article, we mainly focus on the gas-sensing properties of MOS gas sensors and summarize the methods that are based on the interface effect of MOS materials and micro–nanostructures to improve their performance. These methods include noble metal modification, doping, and core-shell (C-S) nanostructure. Moreover, we also describe the mechanism of these methods to analyze the advantages and disadvantages of energy barrier modulation and electron transfer for gas adsorption. Finally, we put forward a variety of research ideas based on the above methods to improve the gas-sensing properties. Some perspectives for the development of MOS gas sensors are also discussed.

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Gurlo, Aleksander, and Ralf Riedel. "Control of Gas Sensing Activity in Tailored Nanomaterials for Gas Sensors." Zeitschrift für anorganische und allgemeine Chemie 636, no. 11 (September 2010): 2044. http://dx.doi.org/10.1002/zaac.201008014.

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Averin, I. A., A. A. Karmanov, I. A. Pronin, S. E. Igoshina, N. D. Yakushova, and V. A. Moshnikov. "Kinetic models for sensory response of multicomponent oxide nanomaterials with a hierarchical pore system." Journal of Physics: Conference Series 2059, no. 1 (October 1, 2021): 012001. http://dx.doi.org/10.1088/1742-6596/2059/1/012001.

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Abstract A kinetic model for sensory response of multicomponent oxide nanomaterials used as sensing elements of gas sensors and vacuum gauges is proposed. It is shown that gas-sensitive properties of nanomaterials depend both on their qualitative and quantitative composition, and morphostructure to determine the presence of a hierarchical pore system therein.

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Juang, Feng-Renn, Yi-Hsiang Huang, Hung-Chieh Lan, and Ming-Che Tsai. "Nanocomposite of Tin Oxide and Tungsten Oxide for Ethanol Sensing Applications." ECS Journal of Solid State Science and Technology 11, no. 4 (April 1, 2022): 045013. http://dx.doi.org/10.1149/2162-8777/ac6698.

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Tungsten oxide (WO3) and tin oxide (SnO2) nanostructures are hydrothermally synthesized in this research. Fabrication process is simple and inexpensive. The nanomaterials are analyzed and proved that they are with high purity and high crystallinity through different techniques. By combining these two nanomaterials, the SnO2/WO3 nanocomposite is made into an ethanol gas sensor. Not only large surface area but also a heterojunction between SnO2 and WO3 enhance the sensing ability of the sensor. It has high sensing response ratio of 262.61% to 100 ppm ethanol gas at 120 °C. Fast response and recovery times are also worth noting. The fabricated gas sensor can help detecting ethanol concentration in different fields.

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Galstyan, V., E. Comini, I. Kholmanov, A. Ponzoni, V. Sberveglieri, N. Poli, G. Faglia, and G. Sberveglieri. "Graphene-zinc Oxide Based Nanomaterials for Gas Sensing Devices." Procedia Engineering 168 (2016): 1172–75. http://dx.doi.org/10.1016/j.proeng.2016.11.395.

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Lyson-Sypien, B., M. Radecka, M. Rekas, K. Swierczek, K. Michalow-Mauke, T. Graule, and K. Zakrzewska. "Grain-size-dependent gas-sensing properties of TiO2 nanomaterials." Sensors and Actuators B: Chemical 211 (May 2015): 67–76. http://dx.doi.org/10.1016/j.snb.2015.01.050.

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Sun, Menghan, Yanyan Yin, Chengwen Song, Yonggang Wang, Jingkun Xiao, Shengchun Qu, Weibao Zheng, Chen Li, Wei Dong, and Li Zhang. "Preparation of Bi2MoO6 Nanomaterials and Theirs Gas-Sensing Properties." Journal of Inorganic and Organometallic Polymers and Materials 26, no. 2 (December 16, 2015): 294–301. http://dx.doi.org/10.1007/s10904-015-0316-0.

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Hashtroudi, Hanie, Ian D. R. Mackinnon, and Mahnaz Shafiei. "Emerging 2D hybrid nanomaterials: towards enhanced sensitive and selective conductometric gas sensors at room temperature." Journal of Materials Chemistry C 8, no. 38 (2020): 13108–26. http://dx.doi.org/10.1039/d0tc01968b.

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Steinhauer, Stephan. "Gas Sensors Based on Copper Oxide Nanomaterials: A Review." Chemosensors 9, no. 3 (March 5, 2021): 51. http://dx.doi.org/10.3390/chemosensors9030051.

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Metal oxide semiconductors have found widespread applications in chemical sensors based on electrical transduction principles, in particular for the detection of a large variety of gaseous analytes, including environmental pollutants and hazardous gases. This review recapitulates the progress in copper oxide nanomaterial-based devices, while discussing decisive factors influencing gas sensing properties and performance. Literature reports on the highly sensitive detection of several target molecules, including volatile organic compounds, hydrogen sulfide, carbon monoxide, carbon dioxide, hydrogen and nitrogen oxide from parts-per-million down to parts-per-billion concentrations are compared. Physico-chemical mechanisms for sensing and transduction are summarized and prospects for future developments are outlined.

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Zhou, Xinyuan, Zhenjie Xue, Xiangyu Chen, Chuanhui Huang, Wanqiao Bai, Zhili Lu, and Tie Wang. "Nanomaterial-based gas sensors used for breath diagnosis." Journal of Materials Chemistry B 8, no. 16 (2020): 3231–48. http://dx.doi.org/10.1039/c9tb02518a.

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Gas-sensing applications commonly use nanomaterials (NMs) because of their unique physicochemical properties, including a high surface-to-volume ratio, enormous number of active sites, controllable morphology, and potential for miniaturisation.

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Lyson-Sypien, Barbara, Anna Kusior, Mieczylaw Rekas, Jan Zukrowski, Marta Gajewska, Katarzyna Michalow-Mauke, Thomas Graule, Marta Radecka, and Katarzyna Zakrzewska. "Nanocrystalline TiO2/SnO2 heterostructures for gas sensing." Beilstein Journal of Nanotechnology 8 (January 12, 2017): 108–22. http://dx.doi.org/10.3762/bjnano.8.12.

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The aim of this research is to study the role of nanocrystalline TiO2/SnO2 n–n heterojunctions for hydrogen sensing. Nanopowders of pure SnO2, 90 mol % SnO2/10 mol % TiO2, 10 mol % SnO2/90 mol % TiO2 and pure TiO2 have been obtained using flame spray synthesis (FSS). The samples have been characterized by BET, XRD, SEM, HR-TEM, Mössbauer effect and impedance spectroscopy. Gas-sensing experiments have been performed for H2 concentrations of 1–3000 ppm at 200–400 °C. The nanomaterials are well-crystallized, anatase TiO2, rutile TiO2 and cassiterite SnO2 polymorphic forms are present depending on the chemical composition of the powders. The crystallite sizes from XRD peak analysis are within the range of 3–27 nm. Tin exhibits only the oxidation state 4+. The H2 detection threshold for the studied TiO2/SnO2 heterostructures is lower than 1 ppm especially in the case of SnO2-rich samples. The recovery time of SnO2-based heterostructures, despite their large responses over the whole measuring range, is much longer than that of TiO2-rich samples at higher H2 flows. TiO2/SnO2 heterostructures can be intentionally modified for the improved H2 detection within both the small (1–50 ppm) and the large (50–3000 ppm) concentration range. The temperature T max at which the semiconducting behavior begins to prevail upon water desorption/oxygen adsorption depends on the TiO2/SnO2 composition. The electrical resistance of sensing materials exhibits a power-law dependence on the H2 partial pressure. This allows us to draw a conclusion about the first step in the gas sensing mechanism related to the adsorption of oxygen ions at the surface of nanomaterials.

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Vuong, Dang Duc, Le Tung Ung, Nguyen Thanh Nghi, Luong Huu Phuoc, Cao Tien Khoa, Vu Xuan Hien, and Nguyen Duc Chien. "Enhanced synthesis of Mg(OH)₂ hexagonal nanosheets using Mg powder and H₂O₂ solution and an observation of its NH₃ sensing behaviour at room temperature." Advances in Natural Sciences: Nanoscience and Nanotechnology 13, no. 3 (September 1, 2022): 035013. http://dx.doi.org/10.1088/2043-6262/ac8d90.

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Abstract Magnesium is one of the most common metals in the Earth’s crust, so Mg(OH)2 nanomaterials made directly from magnesium metal have a wide range of applications. Mg(OH)2 nanosheets can be synthesised directly from Mg powder and H2O2 solution below 200 °C. The thickness of these plates decreases as the sample processing temperature increases. The optical bandgap of the synthesised samples ranges from 5.0 eV to 5.7 eV. At 25 °C, the synthesised Mg(OH)2 nanosheets could detect NH3 gas. The gas sensing mechanism was proposed and discussed, where the Mg(OH)2/H2O structure was considered a p-type semiconductor with the carrier of H3O+. The effects of parameters, such as working temperature and ambient humidity, on the electrical resistance and gas sensing properties of the Mg(OH)2 nanosheets were investigated. The NH3 sensing properties of these materials at room temperature were also compared with those of other nanomaterials.

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Liao, Zhijia, Yao Yu, Zhenyu Yuan, and Fanli Meng. "Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites." Chemosensors 9, no. 10 (October 6, 2021): 284. http://dx.doi.org/10.3390/chemosensors9100284.

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In this paper, ZnO-TiO2-rGO nanocomposites were successfully synthesized by the hydrothermal method. The morphology and structure of the synthesized nanomaterials were characterized by SEM, XRD, HRTEM, and XPS. Butanone is a typical ketone product. The vapors are extremely harmful once exposed, triggering skin irritation in mild cases and affecting our breathing in severe cases. In this paper, the gas-sensing properties of TiO2, ZnO, ZnO-TiO2, and ZnO-TiO2-rGO nanomaterials to butanone vapor were studied. The optimum operating temperature of the ZnO-TiO2-rGO sensor is 145 °C, which is substantially lower than the other three sensors. The selectivity for butanone vapor is greatly improved, and the response is 5.6 times higher than that of other organic gases. The lower detection limit to butanone can reach 63 ppb. Therefore, the ZnO-TiO2-rGO sensor demonstrates excellent gas-sensing performance to butanone. Meanwhile, the gas-sensing mechanism of the ZnO-TiO2-rGO sensor to butanone vapor was also analyzed.

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Nguyen, Hieu Van, Hong Si Hoang, Trung Dang Do, Binh Thi Bui, Chinh Duc Nguyen, Duy Van Nguyen, and Hoa Duc Nguyen. "Our recent study on nanomaeterials for gas sensing applictaion." Science and Technology Development Journal 16, no. 1 (March 31, 2013): 112–37. http://dx.doi.org/10.32508/stdj.v16i1.1426.

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Recently, novel materials such as semiconductor metal oxide (SMO) nanowires (NWs), carbon nanotubes (CNTs), and hybrid materials SMO/CNTs have been attractively received attention for gas sensing applications. These materials are potential candidates for improving the well known “3S”: Sensitivity, Selectivity and Stability. In this article, we describe our recent studies on synthesis and characterizations of nanomaterials for gas-sensing applications. The focused topics include are: (i) various system of hybrid materials made CNTs and SMO; and (ii) quasi-one-dimension (Q1D) nanostructure of SMO materials. The synthesis, characterizations and gas-sensing properties are deal thoroughly. Gas-sensing mechanism of those materials, possibility producing new novel materials and other novel applications are also discussed

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Meng, Fanli, Tao Zhu, Zhenyu Yuan, Wenbo Qin, Hongliang Gao, and Hua Zhang. "Investigation of Mixed-Phase WS2 Nanomaterials for Ammonia Gas Sensing." IEEE Sensors Journal 21, no. 6 (March 15, 2021): 7268–74. http://dx.doi.org/10.1109/jsen.2021.3050145.

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Zhu, Yunjing, Yunlei Ma, Dandan Wu, and Guojian Jiang. "Preparation and gas sensing properties of ZnO/MXene composite nanomaterials." Sensors and Actuators A: Physical 344 (September 2022): 113740. http://dx.doi.org/10.1016/j.sna.2022.113740.

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Tang, Hong, Lingling Qi, and Yulun Pan. "Nickel Oxide Nanomaterials: Growth, Characterization and Formaldehyde Gas Sensing Applications." Journal of Nanoelectronics and Optoelectronics 13, no. 8 (August 1, 2018): 1128–33. http://dx.doi.org/10.1166/jno.2018.2385.

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Li, Lei, Huiming Lin, and Fengyu Qu. "Synthesis of mesoporous SnO2 nanomaterials with selective gas-sensing properties." Journal of Sol-Gel Science and Technology 67, no. 3 (July 23, 2013): 545–55. http://dx.doi.org/10.1007/s10971-013-3113-7.

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Govardhan, K., and Andrews Nirmala Grace. "Temperature Optimized Ammonia and Ethanol Sensing Using Ce Doped Tin Oxide Thin Films in a Novel Flow Metric Gas Sensing Chamber." Journal of Sensors 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/7652450.

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A simple process of gas sensing is represented here using Ce doped tin oxide nanomaterial based thin film sensor. A novel flow metric gas chamber has been designed and utilized for gas sensing. Doping plays a vital role in enhancing the sensing properties of nanomaterials. Ce doped tin oxide was prepared by hydrothermal method and the same has been used to fabricate a thin film for sensing. The microstructure and morphology of the prepared materials were analysed by SEM, XRD, and FTIR analysis. The SEM images clearly show that doping can clamp down the growth of the large crystallites and can lead to large agglomeration spheres. Thin film gas sensors were formed from undoped pure SnO2and Ce doped SnO2. The sensors were exposed to ammonia and ethanol gases. The responses of the sensors to different concentrations (50–500 ppm) of ammonia and ethanol at different operating temperatures (225°C–500°C) were studied. Results show that a good sensitivity towards ammonia was obtained with Ce doped SnO2thin film sensor at an optimal operating temperature of 325°C. The Ce doped sensor also showed good selectivity towards ammonia when compared with ethanol. Pure SnO2showed good sensitivity with ethanol when compared with Ce doped SnO2thin film sensor. Response time of the sensor and its stability were also studied.

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Bhati, Vijendra Singh, Vishakha Takhar, Ramesh Raliya, Mahesh Kumar, and Rupak Banerjee. "Recent advances in g-C₃N₄ based gas sensors for the detection of toxic and flammable gases: a review." Nano Express 3, no. 1 (March 1, 2022): 014003. http://dx.doi.org/10.1088/2632-959x/ac477b.

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Abstract In recent years, many 2D nanomaterials like graphene, MoS2, phosphorene, and metal oxide nanosheets have been investigated for gas sensing applications due to their excellent properties. Amongst other 2D nanomaterials, graphitic carbon nitride (g-C3N4) has attracted significant attention owing to its simple synthesis process, tunable electronic properties, and exceptional physicochemical properties. Such remarkable properties assert g-C3N4 as a potential candidate for the next-generation high-performance gas sensors employed in the detection of toxic and flammable gases. Although several articles and reviews are available on g-C3N4 for their synthesis, functionalities, and applications for the detection of humidity. Few of them have focused their attention on gas sensing using g-C3N4. Thus, in this review, we have methodically summed up the recent advances in g-C3N4 and its composites-based gas sensor for the detection of toxic and flammable gases. Moreover, we have also incorporated the synthesis strategies and the comprehensive physics of g-C3N4 based gas sensors. Additionally, different approaches are presented for the enhancement of gas sensing/detecting properties of g-C3N4 based gas sensors. Finally, the challenges and future scope of g-C3N4 based gas sensors for real-time monitoring of gases have been discussed.

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Shi, Yushu, Huiyan Xu, Tongyao Liu, Shah Zeb, Yong Nie, Yiming Zhao, Chengyuan Qin, and Xuchuan Jiang. "Advanced development of metal oxide nanomaterials for H2 gas sensing applications." Materials Advances 2, no. 5 (2021): 1530–69. http://dx.doi.org/10.1039/d0ma00880j.

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Wu, Yu, Jing Feng, Guang Hu, En Zhang, and Huan-Huan Yu. "Colorimetric Sensors for Chemical and Biological Sensing Applications." Sensors 23, no. 5 (March 2, 2023): 2749. http://dx.doi.org/10.3390/s23052749.

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Colorimetric sensors have been widely used to detect numerous analytes due to their cost-effectiveness, high sensitivity and specificity, and clear visibility, even with the naked eye. In recent years, the emergence of advanced nanomaterials has greatly improved the development of colorimetric sensors. This review focuses on the recent (from the years 2015 to 2022) advances in the design, fabrication, and applications of colorimetric sensors. First, the classification and sensing mechanisms of colorimetric sensors are briefly described, and the design of colorimetric sensors based on several typical nanomaterials, including graphene and its derivatives, metal and metal oxide nanoparticles, DNA nanomaterials, quantum dots, and some other materials are discussed. Then the applications, especially for the detection of metallic and non-metallic ions, proteins, small molecules, gas, virus and bacteria, and DNA/RNA are summarized. Finally, the remaining challenges and future trends in the development of colorimetric sensors are also discussed.

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Łysoń-Sypień, B., K. Zakrzewska, M. Gajewska, and M. Radecka. "Hydrogen Sensor Of TiO2-Based Nanomaterials." Archives of Metallurgy and Materials 60, no. 2 (June 1, 2015): 935–40. http://dx.doi.org/10.1515/amm-2015-0233.

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Abstract The aim of this research was to examine gas sensing properties of TiO2 based nanomaterials. Nanopowders of Cr doped TiO2 with constant Specific Surface Area, SSA, were obtained using Flame Spray Synthesis technique, FSS. Nanomaterials were characterized by Brunauer – Emmett – Teller adsorption isotherms, BET, X – ray diffraction, XRD, Transmission Electron Microscopy, TEM, optical spectrometry UV – vis with the use of an integrating sphere as well as impedance spectroscopy. Detection of hydrogen was carried out over the concentration range of 50 - 3000 ppm at the temperatures extending from 200 to 400°C and synthetic air working as a reference atmosphere. As a result of experiments it appeared that incorporation of 5 at.% of Cr into TiO2 improved hydrogen sensing features due to small crystallite size and predominance of rutile polymorphic phase.

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Wang, Ze, Lei Zhu, Shiyi Sun, Jianan Wang, and Wei Yan. "One-Dimensional Nanomaterials in Resistive Gas Sensor: From Material Design to Application." Chemosensors 9, no. 8 (July 30, 2021): 198. http://dx.doi.org/10.3390/chemosensors9080198.

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With a series of widespread applications, resistive gas sensors are considered to be promising candidates for gas detection, benefiting from their small size, ease-of-fabrication, low power consumption and outstanding maintenance properties. One-dimensional (1-D) nanomaterials, which have large specific surface areas, abundant exposed active sites and high length-to-diameter ratios, enable fast charge transfers and gas-sensitive reactions. They can also significantly enhance the sensitivity and response speed of resistive gas sensors. The features and sensing mechanism of current resistive gas sensors and the potential advantages of 1-D nanomaterials in resistive gas sensors are firstly reviewed. This review systematically summarizes the design and optimization strategies of 1-D nanomaterials for high-performance resistive gas sensors, including doping, heterostructures and composites. Based on the monitoring requirements of various characteristic gases, the available applications of this type of gas sensors are also classified and reviewed in the three categories of environment, safety and health. The direction and priorities for the future development of resistive gas sensors are laid out.

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Kałużyński, Piotr Dariusz, Marcin Procek, and Agnieszka Stolarczyk. "Impact of UV radiation on sensing properties of conductive polymer and ZnO blend for NO2 gas sensing at room temperature." Photonics Letters of Poland 11, no. 3 (September 30, 2019): 69. http://dx.doi.org/10.4302/plp.v11i3.911.

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In this paper we present an investigation on UV radiation on organic-inorganic blend made from conductive polymer (regio-regular poly(3-hexyltiophene) (rr-P3HT) and zinc oxide (ZnO) nanomaterial, which was used as a sensing layer for chemoresistor structure. The study showed that UV radiation has a significant impact on the dynamics of the response of the sensor being studied, which can be a significant element to improve the operation of such sensors at room temperature. Full Text: PDF ReferencesKampa, M.., Castanas, E., "Human health effects of air pollution," Environ. Pollut. 151(2), 362-367 (2008). CrossRef Procek, M., Stolarczyk, A., Pustelny, T.., Maciak, E., "A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air.," Sensors (Basel). 15(4), 9563-9581, MDPI AG (2015). CrossRef Procek M., Stolarczyk A., "Influence of near UV irradiation on ZnO nanomaterials NO2 gas sensing properties," Proc. SPIE 10830, 13th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 108300P (14 August 2018); doi: 10.1117/12.2503471 CrossRef Procek M., Stolarczyk A., Maciak E., "Study of the impact ofUV radiation on NO2 sensing properties of graft comb copolymers of poly(3-hexylthiophene) at room temperature," Proc. SPIE 10455, 12th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 104550N (1 September 2017); doi: 10.1117/12.2282777 CrossRef Djurišić, A.B. & Ng, Alan Man Ching & Chen, Xinyi. (2010). ZnO Nanostructures for Optoelectronics: Material Properties and Device Applications. Progress in Quantum Electronics. 34. 191-259. 10.1016/j.pquantelec.2010.04.001. CrossRef Xie, Tao & Xie, Guangzhong & Du, Hongfei & Su, Yuanjie & Ye, Zongbiao & Chen, Yuyan & Jiang, Yadong. (2015). Two novel methods for evaluating the performance of OTFT gas sensors. Sensors and Actuators B: Chemical. 230. 10.1016/j.snb.2015.12.056. CrossRef Procek, M.; Stolarczyk, A.; Pustelny, T. Impact of Temperature and UV Irradiation on Dynamics of NO2 Sensors Based on ZnO Nanostructures. Nanomaterials 2017, 7, 312. CrossRef

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Wang, Tao, Hongli Ma, Wenkai Jiang, Hexin Zhang, Min Zeng, Jianhua Yang, Xue Wang, Ke Liu, Renhua Huang, and Zhi Yang. "Type discrimination and concentration prediction towards ethanol using a machine learning–enhanced gas sensor array with different morphology-tuning characteristics." Physical Chemistry Chemical Physics 23, no. 41 (2021): 23933–44. http://dx.doi.org/10.1039/d1cp02394b.

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Microwave-assisted method has been developed to synthesize ZnO gas sensing nanomaterials with controllable hierarchical structures. Machine learning algorithms such as PCA, SVM, ELM, and BP further improve the selectivity and quantitation.

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Pandhi, Twinkle, Ashita Chandnani, Harish Subbaraman, and David Estrada. "A Review of Inkjet Printed Graphene and Carbon Nanotubes Based Gas Sensors." Sensors 20, no. 19 (October 2, 2020): 5642. http://dx.doi.org/10.3390/s20195642.

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Graphene and carbon nanotube (CNT)-based gas/vapor sensors have gained much traction for numerous applications over the last decade due to their excellent sensing performance at ambient conditions. Inkjet printing various forms of graphene (reduced graphene oxide or modified graphene) and CNT (single-wall nanotubes (SWNTs) or multiwall nanotubes (MWNTs)) nanomaterials allows fabrication onto flexible substrates which enable gas sensing applications in flexible electronics. This review focuses on their recent developments and provides an overview of the state-of-the-art in inkjet printing of graphene and CNT based sensors targeting gases, such as NO2, Cl2, CO2, NH3, and organic vapors. Moreover, this review presents the current enhancements and challenges of printing CNT and graphene-based gas/vapor sensors, the role of defects, and advanced printing techniques using these nanomaterials, while highlighting challenges in reliability and reproducibility. The future potential and outlook of this rapidly growing research are analyzed as well.

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Berni, Rossella, and Francesco Bertocci. "Optimization of Gas Sensors Based on Advanced Nanomaterials through Split-Plot Designs and GLMMs." Sensors 18, no. 11 (November 9, 2018): 3858. http://dx.doi.org/10.3390/s18113858.

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This paper deals with the planning and modeling of a split-plot experiment to improve novel gas sensing materials based on Perovskite, a nano-structured, semi-conductor material that is sensitive to changes in the concentration of hazardous gas in the ambient air. The study addresses both applied and theoretical issues. More precisely, it focuses on (i) the detection of harmful gases, e.g., NO 2 and CO, which have a great impact on industrial applications as well as a significantly harmful impact on human health; (ii) the planning and modeling of a split-plot design for the two target gases by applying a dual-response modeling approach in which two models, e.g., location and dispersion models, are estimated; and (iii) a robust process optimization conducted in the final modeling step for each target gas and for each gas sensing material, conditioned to the minimization of the working temperature. The dual-response modeling allows us to achieve satisfactory estimates for the process variables and, at the same time, good diagnostic valuations. Optimal solutions are obtained for each gas sensing material while also improving the results achieved from previous studies.

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Mintcheva, Neli, Dinesh Kumar Subbiah, Marat E. Turabayev, Stanislav O. Gurbatov, John Bosco Balaguru Rayappan, Aleksandr A. Kuchmizhak, and Sergei A. Kulinich. "Gas Sensing of Laser-Produced Hybrid TiO2-ZnO Nanomaterials under Room-Temperature Conditions." Nanomaterials 13, no. 4 (February 9, 2023): 670. http://dx.doi.org/10.3390/nano13040670.

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The preparation method can considerably affect the structural, morphological, and gas-sensing properties of mixed-oxide materials which often demonstrate superior photocatalytic and sensing performance in comparison with single-metal oxides. In this work, hybrids of semiconductor nanomaterials based on TiO2 and ZnO were prepared by laser ablation of Zn and Ti plates in water and then tested as chemiresistive gas sensors towards volatile organics (2-propanol, acetaldehyde, ethanol, methanol) and ammonia. An infrared millisecond pulsed laser with energy 2.0 J/pulse and a repetition rate of 5 Hz was applied to Zn and Ti metal targets in different ablation sequences to produce two nano-hybrids (TiO2/ZnO and ZnO/TiO2). The surface chemistry, morphology, crystallinity, and phase composition of the prepared hybrids were found to tune their gas-sensing properties. Among all tested gases, sample TiO2/ZnO showed selectivity to ethanol, while sample ZnO/TiO2 sensed 2-propanol at room temperature, both with a detection limit of ~50 ppm. The response and recovery times were found to be 24 and 607 s for the TiO2/ZnO sensor, and 54 and 50 s for its ZnO/TiO2 counterpart, respectively, towards 100 ppm of the target gas at room temperature.

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Cai, Ya Hui, Shu Yi Ma, Ting Ting Yang, Peng Fei Cao, Li Wang, Hao Sheng, and Miao Miao Liu. "Preparation of YVO4 octahedral nanomaterials and gas-sensing characteristics to triethylamine." Journal of Alloys and Compounds 897 (March 2022): 163167. http://dx.doi.org/10.1016/j.jallcom.2021.163167.

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Kononova, Irina, Vyacheslav Moshnikov, and Pavel Kononov. "SnO2-Based Porous Nanomaterials: Sol-Gel Formation and Gas-Sensing Application." Gels 9, no. 4 (March 31, 2023): 283. http://dx.doi.org/10.3390/gels9040283.

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Porous nanocomposites using two (tin dioxide–silica dioxide) and three (tin dioxide–indium oxide-silica dioxide)-component systems for gas sensors were created with the sol–gel method. To understand some of the physical–chemical processes that occurred during the adsorption of gas molecules on the surface of the produced nanostructures, two models—the Langmuir model and the Brunauer–Emmett–Teller theory—were used to carry out calculations. The results of the phase analysis concerning the interaction between the components during the formation of the nanostructures were obtained through the use of X-ray diffraction, thermogravimetric analysis, the Brunauer–Emmett–Teller technique (to determine the surface areas), the method of partial pressure diagrams in a wide range of temperatures and pressures and the results of the measurement of the nanocomposites’ sensitivity. The analysis allowed us to find the optimal temperature for annealing nanocomposites. The introduction of a semiconductor additive into a two-component system based on tin and silica dioxides significantly increased the sensitivity of the nanostructured layers to reductional reagent gases.

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Yuan, Zhenyu, Rui Li, Fanli Meng, Junjie Zhang, Kaiyuan Zuo, and Erchou Han. "Approaches to Enhancing Gas Sensing Properties: A Review." Sensors 19, no. 7 (March 27, 2019): 1495. http://dx.doi.org/10.3390/s19071495.

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A gas nanosensor is an instrument that converts the information of an unknown gas (species, concentration, etc.) into other signals (for example, an electrical signal) according to certain principles, combining detection principles, material science, and processing technology. As an effective application for detecting a large number of dangerous gases, gas nanosensors have attracted extensive interest. However, their development and application are restricted because of issues such as a low response, poor selectivity, and high operation temperature, etc. To tackle these issues, various measures have been studied and will be introduced in this review, mainly including controlling the nanostructure, doping with 2D nanomaterials, decorating with noble metal nanoparticles, and forming the heterojunction. In every section, recent advances and typical research, as well mechanisms, will also be demonstrated.

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Journal articles on the topic 'Nanomaterials - Gas Sensing'

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