Thematische Bibliographien / Gas microsensors

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Auswahl der wissenschaftlichen Literatur zum Thema „Gas microsensors“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Gas microsensors"

Sandfeld, Tobias, Louise Vinther Grøn, Laura Munoz, Rikke Louise Meyer, Klaus Koren, and Jo Philips. "Considerations on the use of microsensors to profile dissolved H2 concentrations in microbial electrochemical reactors." PLOS ONE 19, no. 1 (2024): e0293734. http://dx.doi.org/10.1371/journal.pone.0293734.

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Measuring the distribution and dynamics of H2 in microbial electrochemical reactors is valuable to gain insights into the processes behind novel bioelectrochemical technologies, such as microbial electrosynthesis. Here, a microsensor method to measure and profile dissolved H2 concentrations in standard H-cell reactors is described. Graphite cathodes were oriented horizontally to enable the use of a motorized microprofiling system and a stereomicroscope was used to place the H2 microsensor precisely on the cathode surface. Profiling was performed towards the gas-liquid interface, while preserving the electric connections and flushing the headspace (to maintain anoxic conditions) and under strict temperature control (to overcome the temperature sensitivity of the microsensors). This method was tested by profiling six reactors, with and without inoculation of the acetogen Sporomusa ovata, at three different time points. H2 accumulated over time in the abiotic controls, while S. ovata maintained low H2 concentrations throughout the liquid phase (< 4 μM) during the whole experimental period. These results demonstrate that this setup generated insightful H2 profiles. However, various limitations of this microsensor method were identified, as headspace flushing lowered the dissolved H2 concentrations over time. Moreover, microsensors can likely not accurately measure H2 in the immediate vicinity of the solid cathode, because the solids cathode surface obstructs H2 diffusion into the microsensor. Finally, the reactors had to be discarded after microsensor profiling. Interested users should bear these considerations in mind when applying microsensors to characterize microbial electrochemical reactors.

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Jung, Dong Geon, Junyeop Lee, Jin Beom Kwon, Bohee Maeng, Hee Kyung An, and Daewoong Jung. "Low-Voltage-Driven SnO2-Based H2S Microsensor with Optimized Micro-Heater for Portable Gas Sensor Applications." Micromachines 13, no. 10 (2022): 1609. http://dx.doi.org/10.3390/mi13101609.

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To realize portable gas sensor applications, it is necessary to develop hydrogen sulfide (H2S) microsensors capable of operating at lower voltages with high response, good selectivity and stability, and fast response and recovery times. A gas sensor with a high operating voltage (>5 V) is not suitable for portable applications because it demands additional circuitry, such as a charge pump circuit (supply voltage of common circuits is approximately 1.8–5 V). Among H2S microsensor components, that is, the substrate, sensing area, electrode, and micro-heater, the proper design of the micro-heater is particularly important, owing to the role of thermal energy in ensuring the efficient detection of H2S. This study proposes and develops tin (IV)-oxide (SnO2)-based H2S microsensors with different geometrically designed embedded micro-heaters. The proposed micro-heaters affect the operating temperature of the H2S sensors, and the micro-heater with a rectangular mesh pattern exhibits superior heating performance at a relatively low operating voltage (3–4 V) compared to those with line (5–7 V) and rectangular patterns (3–5 V). Moreover, utilizing a micro-heater with a rectangular mesh pattern, the fabricated SnO2-based H2S microsensor was driven at a low operating voltage and offered good detection capability at a low H2S concentration (0–10 ppm), with a quick response (<51 s) and recovery time (<101 s).

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Siegal, M. P., W. G. Yelton, D. L. Overmyer, and P. P. Provencio. "Nanoporous Carbon Films for Gas Microsensors." Langmuir 20, no. 4 (2004): 1194–98. http://dx.doi.org/10.1021/la034460s.

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Vallejos, Stella, Zdenka Fohlerová, Milena Tomić, Isabel Gràcia, Eduard Figueras, and Carles Cané. "Room Temperature Ethanol Microsensors Based on Silanized Tungsten Oxide Nanowires." Proceedings 2, no. 13 (2018): 790. http://dx.doi.org/10.3390/proceedings2130790.

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Gas microsensors based on tungsten oxide (WO3-x) nanowires (NWs) silanized with APTES (3-aminopropyltriethoxysilane) are developed in this work. These surface modified microsensors are highly sensitive to ethanol at room temperature (RT) via photoactivation and show enhanced selectivity towards other volatile organic compounds (VOCs) including acetone and toluene.

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Siegal, M. P., and W. G. Yelton. "Nanoporous-Carbon Coatings for Gas-Phase Chemical Microsensors." Advances in Science and Technology 48 (October 2006): 161–68. http://dx.doi.org/10.4028/www.scientific.net/ast.48.161.

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Nanoporous-carbon (NPC) is compared directly to commonly-used polymers as a gassorbing coating material on surface acoustic wave (SAW) microsensor devices. The sensing capability of these materials is measured for volatile organic compounds (VOCs), toxic-industrial chemicals (TICs), and a chemical warfare agents (CWA) simulant. All of the coatings reversibly sorb and desorb the volatile VOC and TIC compounds, however, NPC outperforms the polymers over the range of analyte concentrations studied, especially at the lowest levels, by multiple ordersof- magnitude. Conversely, NPC has good retention properties for the semi-volatile CWA simulant tested, which while detrimental for use on a reversible SAW device, infers that NPC may be wellsuited as a preconcentrator coating for such analytes. NPC is a highly-disordered low-density carbon containing both nanopores and increased interplanar spacing between graphene sheet fragments, self-assembles using pulsed laser deposition, has no residual-stress at room temperature, is stable to 600 °C, and is chemically-inert in harsh environments. It has superior chemical and aging properties compared to the conventional polymer films used in microsensor devices.

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Penza, M., R. Rossi, M. Alvisi, et al. "Metalloporphyrin-Modified Carbon Nanotube Layers for Gas Microsensors." Sensor Letters 9, no. 2 (2011): 913–19. http://dx.doi.org/10.1166/sl.2011.1643.

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Bolotov, V. V., P. M. Korusenko, S. N. Nesov, et al. "Nanocomposite por-Si/SnOx layers formation for gas microsensors." Materials Science and Engineering: B 177, no. 1 (2012): 1–7. http://dx.doi.org/10.1016/j.mseb.2011.09.006.

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Swart, N., and A. Nathan. "Numerical study of heat transport in thermally isolated flow-rate microsensors." Canadian Journal of Physics 70, no. 10-11 (1992): 904–7. http://dx.doi.org/10.1139/p92-143.

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The temperature distributions in thermally isolated cantilever based flow-rate microsensors have been numerically calculated for different gas temperatures and gas velocities. In particular, we investigate the efficiency of heat transfer to the flowing gas and corresponding directions of heat flow in the system. The above analysis is based on a solution to the energy equation under appropriate boundary conditions. The equation was discretized using a control volume procedure, based on which an equivalent circuit was devised and subsequently simulated using a circuit simulator such as SPICE.

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Vittoriosi, Alice, Juergen J. Brandner, and Roland Dittmeyer. "Integrated temperature microsensors for the characterization of gas heat transfer." Journal of Physics: Conference Series 362 (May 23, 2012): 012021. http://dx.doi.org/10.1088/1742-6596/362/1/012021.

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Penza, M., R. Rossi, M. Alvisi, D. Suriano, and E. Serra. "Pt-modified carbon nanotube networked layers for enhanced gas microsensors." Thin Solid Films 520, no. 3 (2011): 959–65. http://dx.doi.org/10.1016/j.tsf.2011.04.178.

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Dissertationen zum Thema "Gas microsensors"

Kumar, Abhishek. "Development, characterization and experimental validation of metallophthalocyanines based microsensors devoted to monocyclic aromatic hydrocarbon monitoring in air." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22635/document.

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Résumé indisponible This PhD work is dedicated to investigate potentialities of phthalocyanines materials to realize a Quartz Crystal Microbalance (QCM) sensor for Benzene, Toluene and Xylenes (BTX) detection in air. The goal is to develop a sensor-microsystem capable of measuring BTX concentrations quantitatively below the environmental guidelines with sufficient accuracy. To achieve these objectives, our strategies mainly focused on experimental works encompassing sensors realization, sensing material characterizations, development of gas-testing facility and sensor testing for different target gases. One of the main aims is to identify most appropriate phthalocyanine material for sensor development. After comparative sensing studies, tert-butyl-copper phthalocyanine based QCM device is found as most sensitive and detail metrological characteristics are further investigated. Results show repeatable, reversible and high magnitude of response, low response and recovery times, sub-ppm range detection limit, high resolutions and combined selectivity of BTX gases among common atmospheric pollutants. Special focus is given to understand the gas/material interactions which are achieved by (a) XRD and SEM characterizations of sensing layers, (b) formalization of a two-step adsorption model and (c) assessing extent of diffusion of target gas in sensing layer. At last, possible ageing of sensor and suitable storage conditions to prevent such effect are investigated

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Abercrombie, Matthew G. "Acoustic microsensor with optical detection for high-temperature, high-pressure environments." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19467.

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Al-Khalifa, Sherzad. "Identification of a binary gas mixture from a single resistive microsensor." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/52652/.

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Increasing concern about the rapid escalation of environmental pollution has led to strong legislation to ensure, for example, that the emission of pollutants from vehicles and industries is controlled to an acceptable level. As a consequence, there has been a rapid expansion of research into developing more efficient and low-cost gas monitoring systems. Currently, commercial solid-state atmospheric gas detection systems are based on one sensor for each gas, while research systems are an array of sensors for the detection of multiple gases. In this research, techniques are developed whereby more than one gas is detected using a single resistive gas sensor. A novel modulated temperature technique was used to enhance the selectivity of the resistive SnO2 gas sensor. Fast Fourier transforms was used to extract the Fourier coefficients. These in turn were used as input to neural networks for training and subsequently for prediction purposes. The result has shown that a single doped SnO2 resistive microsensor can be used to classify binary gas mixture in air. The research objectives have been fulfilled in that a novel way in detecting the components and the concentration level of a binary gas mixture was developed. Additionally, a low-cost low-power intelligent gas monitoring system was designed. This included the design of a novel temperature/thermometer circuit.

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Lawson, Bruno. "Nouvelle approche de suivi non invasif de l'alcoolémie par perspiration à l'aide de multicapteurs MOX." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0698.

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Nous proposons dans le cadre de ce travail de thèse, une nouvelle approche de la détection non invasive de l’alcoolémie sanguine à l’aide de microcapteurs d’éthanol à base de SnO2. Cette méthodologie se base sur une détection indirecte de l’alcoolémie sanguine par une mesure des vapeurs d’éthanol émises par la perspiration cutanée suite à une consommation d’alcool. Afin de valider cette approche, il a fallu dans un premier temps démontrer la pertinence et la faisabilité de cette méthodologie de détection par la réalisation d’essais cliniques pilotes en collaboration avec une équipe médicale d’étude pharmacologique du CPCET Marseille. Les différentes mesures du taux d’éthanol réalisées dans les fluides biologiques tels que le sang et l’air expiré ont pu être précisément corrélées avec les mesures de vapeurs d’éthanol réalisées à travers la perspiration à l’aide de trois microcapteurs de gaz commerciaux à base d’oxydes métalliques intégrés à un bracelet. Ces dispositifs ont l’avantage d’être sensibles mais pas sélectifs à la nature du gaz détecté. Durant ces travaux, des couches sensibles de SnO2 ont été déposées par pulvérisation cathodique RF magnétron réactive sur un transducteur breveté par notre équipe, intégrant trois capteurs sur une même puce. L’optimisation des paramètres de dépôt et les analyses structurales des couches de SnO2, nous ont permis de réaliser un multicapteur d’éthanol démontrant des performances sous éthanol ; en termes de sensibilité sous atmosphère humide, de répétabilité et de temps de réponses et de recouvrement ainsi que du point de vue sélectivité A new approach of a noninvasive detection of blood alcohol concentration using ethanol microsensors based on SnO2 Is developed in this work. The methodology is based on an indirect detection of blood alcohol concentration by measuring the ethanol vapor emitted through the skin perspiration after alcohol consumption. In order to validate this approach, first we demonstrated the relevance and the feasibility of this detection method by carrying out pilot clinical trials in collaboration with a medical team of pharmacological study of CPCET Marseille. The different measurements of the ethanol concentration carried out in biological fluids such as blood and exhaled air could be precisely correlated with the measurements of ethanol vapors performed through the perspiration using three commercial gas microsensors based on metal oxides integrated into a bracelet. . These devices have the advantage of being sensitive but not selective to the nature of the gas detected. During this thesis work, sensitive layers of SnO2 were deposited by reactive magnetron RF sputtering on a transducer patented by our team, integrating three sensors on the same chip. The optimization of the deposition parameters and the structural analyzes of the SnO2 layers, allowed us to develop an ethanol multi-sensor demonstrating performances under ethanol; in terms of sensitivity on humidity, repeatability and response and recovery times as well as from the point of selectivity

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Le, Pennec Fabien. "Développement de microcapteurs pour la mesure de dioxyde de carbone (CO2) : application au suivi de la qualité de l’air." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0148.

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A la différence de la pollution de l’air extérieur, celle de l’air intérieur est restée relativement peu étudiée jusqu’au début des années 2000. Pourtant, nous passons en moyenne 85 % de notre temps dans des environnements clos (domicile, bureaux, transports…) dans lesquels nous sommes exposés à de nombreux polluants. De nombreuses études ont montré que la mesure de la concentration du dioxyde de carbone, permet d’évaluer le confinement de l’air intérieur. Pour mesurer les polluants, nous pouvons distinguer les analyseurs et les microcapteurs, avec chacun ses avantages et ses inconvénients. Dans le cas de la qualité de l’air intérieur, les microcapteurs de type résistif paraissent comme la solution la plus appropriée, de par leur faible coût, leur haute sensibilité, leur miniaturisation possible et leur faible consommation. Le phénomène de détection s’établit sur la variation de la résistance électrique de l’élément sensible en réponse à un taux d’adsorption du gaz. Mes travaux de recherche se sont concentrés sur l’étude de la couche sensible. Nous avons utilisé la méthode de dépôt par screen printing, technique simple, rapide et peu coûteuse. La structure cristalline et la morphologie ont pu être déterminées ainsi que l’identification des substances chimiques présentes dans nos matériaux suivant des techniques de caractérisations physico-chimiques. Nos résultats ont montré que les capteurs réalisés à base de La2O2CO3 et de BaTiO3, respectivement, présentent de bonnes performances, avec une forte sensibilité au CO2, et un bon taux de répétabilité Unlike outdoor air pollution, indoor air pollution remained relatively understudied until the early 2000s. However, we spend on average 85% of our time in closed environments (home, offices, transport, etc. in which we are exposed to many pollutants. Numerous studies have shown that measuring the concentration of carbon dioxide makes it possible to assess the confinement of indoor air. To measure pollutants, we can distinguish between analyzers and microsensors, each with its advantages and disadvantages. In the case of indoor air quality, resistive type microsensors appear to be the most appropriate solution, due to their low cost, high sensitivity, possible miniaturization and low power consumption. The detection phenomenon is based on the variation of the electrical resistance of the sensitive element in response to a gas adsorption rate. My research work has focused on the study of the sensitive layer. We used the screen-printing deposit method, a simple, fast and inexpensive technique. The crystalline structure and the morphology could be determined as well as the identification of the chemical substances present in our materials according to physico-chemical characterization techniques. Our results showed that the sensors made from La2O2CO3 and BaTiO3, respectively, present good performances, with a high sensitivity to CO2, and a good repeatability rate

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Chawich, Juliana. "ZnO/GaAs-based acoustic waves microsensor for the detection of bacteria in complex liquid media." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD012/document.

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Cette thèse s’inscrit dans le cadre d’une cotutelle internationale entre l’Université de Bourgogne Franche-Comté en France et l’Université de Sherbrooke au Canada. Elle porte sur le développement d'un biocapteur miniature pour la détection et la quantification de bactéries dans des milieux liquides complexes. La bactérie visée est l’Escherichia coli (E. coli), régulièrement mise en cause dans des épidémies d'infections alimentaires, et parfois meurtrière.La géométrie du biocapteur consiste en une membrane en arséniure de gallium (GaAs) sur laquelle est déposé un film mince piézoélectrique d’oxyde de zinc (ZnO). L'apport du ZnO structuré en couche mince constitue un réel atout pour atteindre de meilleures performances du transducteur piézoélectrique et consécutivement une meilleure sensibilité de détection. Une paire d'électrodes déposée sur le film de ZnO permet de générer sous une tension sinusoïdale une onde acoustique se propageant dans le GaAs, à une fréquence donnée. La face arrière de la membrane, quant à elle, est fonctionnalisée avec une monocouche auto-assemblée (SAM) d'alkanethiols et des anticorps anti-E. coli, conférant la spécificité de la détection. Ainsi, le biocapteur bénéficie à la fois des technologies de microfabrication et de bio-fonctionnalisation du GaAs, déjà validées au sein de l’équipe de recherche, et des propriétés piézoélectriques prometteuses du ZnO, afin d’atteindre potentiellement une détection hautement sensible et spécifique de la bactérie d’intérêt. Le défi consiste à pouvoir détecter et quantifier cette bactérie à de très faibles concentrations dans un échantillon liquide et/ou biologique complexe.Les travaux de recherche ont en partie porté sur les dépôts et caractérisations de couches minces piézoélectriques de ZnO sur des substrats de GaAs. L’effet de l’orientation cristalline du GaAs ainsi que l’utilisation d’une couche intermédiaire de Platine entre le ZnO et le GaAs ont été étudiés par différentes techniques de caractérisation structurale (diffraction des rayons X, spectroscopie Raman, spectrométrie de masse à ionisation secondaire), topographique (microscopie à force atomique), optique (ellipsométrie) et électrique. Après la réalisation des contacts électriques, la membrane en GaAs a été usinée par gravure humide. Une fois fabriqué, le transducteur a été testé en air et en milieu liquide par des mesures électriques, afin de déterminer les fréquences de résonance pour les modes de cisaillement d’épaisseur. Un protocole de bio-fonctionnalisation de surface, validé au sein du laboratoire, a été appliqué à la face arrière du biocapteur pour l’ancrage des SAMs et des anticorps, tout en protégeant la face avant. De plus, les conditions de greffage d’anticorps en termes de concentration utilisée, pH et durée d’incubation, ont été étudiées, afin d’optimiser la capture de bactérie. Par ailleurs, l’impact du pH et de la conductivité de l’échantillon à tester sur la réponse du biocapteur a été déterminé. Les performances du biocapteur ont été évaluées par des tests de détection de la bactérie cible, E. coli, tout en corrélant les mesures électriques avec celles de fluorescence. Des tests de détection ont été réalisés en variant la concentration d’E. coli dans des milieux de complexité croissante. Différents types de contrôles ont été réalisés pour valider les critères de spécificité. En raison de sa petite taille, de son faible coût de fabrication et de sa réponse rapide, le biocapteur proposé pourrait être potentiellement utilisé dans les laboratoires de diagnostic clinique pour la détection d’E. coli This thesis was conducted in the frame of an international collaboration between Université de Bourgogne Franche-Comté in France and Université de Sherbrooke in Canada. It addresses the development of a miniaturized biosensor for the detection and quantification of bacteria in complex liquid media. The targeted bacteria is Escherichia coli (E. coli), regularly implicated in outbreaks of foodborne infections, and sometimes fatal.The adopted geometry of the biosensor consists of a gallium arsenide (GaAs) membrane with a thin layer of piezoelectric zinc oxide (ZnO) on its front side. The contribution of ZnO structured in a thin film is a real asset to achieve better performances of the piezoelectric transducer and consecutively a better sensitivity of detection. A pair of electrodes deposited on the ZnO film allows the generation of an acoustic wave propagating in GaAs under a sinusoidal voltage, at a given frequency. The backside of the membrane is functionalized with a self-assembled monolayer (SAM) of alkanethiols and antibodies anti-E. coli, providing the specificity of detection. Thus, the biosensor benefits from the microfabrication and bio-functionalization technologies of GaAs, validated within the research team, and the promising piezoelectric properties of ZnO, to potentially achieve a highly sensitive and specific detection of the bacteria of interest. The challenge is to be able to detect and quantify these bacteria at very low concentrations in a complex liquid and/or biological sample.The research work partly focused on the deposition and characterization of piezoelectric ZnO thin films on GaAs substrates. The effect of the crystalline orientation of GaAs and the use of a titanium / platinum buffer layer between ZnO and GaAs were studied using different structural (X-ray diffraction, Raman spectroscopy, secondary ionization mass spectrometry), topographic (atomic force microscopy), optical (ellipsometry) and electrical characterizations. After the realization of the electrical contacts on top of the ZnO film, the GaAs membrane was micromachined using chemical wet etching. Once fabricated, the transducer was tested in air and liquid medium by electrical measurements, in order to determine the resonance frequencies for thickness shear mode. A protocol for surface bio-functionalization, validated in the laboratory, was applied to the back of the biosensor for anchoring SAMs and antibodies, while protecting the top side. Furthermore, different conditions of antibody grafting such as the concentration, pH and incubation time, were tested to optimize the immunocapture of bacteria. In addition, the impact of the pH and the conductivity of the solution to be tested on the response of the biosensor has been determined. The performances of the biosensor were evaluated by detection tests of the targeted bacteria, E. coli, while correlating electrical measurements with fluorescence microscopy. Detection tests were completed by varying the concentration of E. coli in environments of increasing complexity. Various types of controls were performed to validate the specificity criteria. Thanks to its small size, low cost of fabrication and rapid response, the proposed biosensor has the potential of being applied in clinical diagnostic laboratories for the detection of E. coli

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Tsai, Ming-Chang, and 蔡明璋. "Gas Microsensors Based on the Nanoporous Structures." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/72631288731412096447.

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碩士 逢甲大學 自動控制工程學系 102 The research develops self-assembled anodic titanium oxide arrays fabricated by anodization and combines the microheater and temperature sensor manufactured by the photolithography and life-off process of the micro-electro-mechanical system technology to selectively detect the CO and CHCl3 gas in room temperature. The advantages of the gas sensors combine anodic titanium oxide thin film, noble metal electrodes, microheater and temperature sensor in the chip have small volume, high stability, high sensitivity and accuracy. The TiO2 arrays fabricated by anodization can built different aspect ratio nanotubes, the inner diameter range is 22-110 nm and the length range is 1.21-1.91μm, by controlling the voltage and anodic time and have high porosity to promote the sensitivity of the gas sensing ability of the sensing film. The gas microsensor can keep the sensor in the best temperature by control the voltage of the microheater and detect the environment temperature by temperature sensor. Experimental results are analyzed to find the relationship between the CO and CHCl3 gas concentrations, the characterization of sensitivity and operational temperatures. Compared to traditional gas sensors, the designed gas microsensors show higher sensitivity to detect CO gas by increasing variation of sensing resistance up to 146.1 % by sensing CO gas concentrations from 40 to 1000 ppm in 200 ℃ and to detect CHCl3 gas by increasing variation of sensing resistance up to 2.99 % by sensing CHCl3 gas concentrations from 10000 to 21000 ppm in room temperature.

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Liu, Tze-chun, and 劉澤鈞. "Gas Microsensors Based on Nanoporous Anodic Aluminum Oxide." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/29622697040391545281.

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碩士 逢甲大學 自動控制工程所 99 A novel CO gas microsensor with tungsten oxide (WO3) sensing film on nanoporous anodic aluminum oxide (AAO) layer has been performed on anodic aluminum oxide template at operation temperature of 25 ℃. Based on microelectromechanical system (MEMS) technology, the microstructures are realized with porous AAO template, WO3 thin films, heaters, and interdigital temperature sensors. The platinum films were deposited to form the heaters, temperature sensors, and interdigital electrodes. To enhance sensitivity, the sputtered WO3 was grown on various nanoporous AAO structures. The study develops a novel porous anodic alumina processing system with a functional current feedback control module that provides control different conditions of voltage, temperature, and etching time to obtain uniform size of AAO film in the range from 20 nm to 104 nm. The self-ordered alumina membranes with a wide range of pore sizes are also achieved to increase sensing area of the microsensor. Experimental results are analyzed to find the relationship between the CO gas concentrations, the characterization of sensitivity and operational temperatures. Compared to traditional gas sensors, the designed CO gas microsensors show higher sensitivity by increasing variation of sensing resistance up to 87.4 % by sensing CO gas concentrations from 100 to 1000 ppm.

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Yang, Ming-Zhi, and 楊閔智. "Integrated Gas Microsensors Array with Circuits on a Chip." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/65522409721908871607.

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博士 國立中興大學 機械工程學系所 103 This study illustrates an integrated gas microsensors array chip fabricated using the standard 0.18 μm CMOS (complementary metal oxide semiconductor) process. The chip includes four gas sensors, four readout circuits and thermometers. The objectives of this study are to utilize the integrated gas microsensors array chip to detect four kinds of volatile organic compound (VOC) gases, the relative humidity of the surroundings and the ambient temperature. After completion of the CMOS process, the chip requires a post-process to etch the sacrificial layer between the interdigitated electrodes and to coat the sensitive film on the electrodes. The sensitive films of integrated gas microsensors array chips are α-Fe2O3, CuO, SnO2, ZrO2 and ZnO, which have good responses for detecting acetone, methanol, ethanol, ammonia and humidity gases, respectively. The characterizations of the sensitive films are observed using a field-emission scanning electron microscope (FE-SEM) to investigate the surface morphology and grain size. Energy dispersive spectrometry (EDS) and x-ray diffraction (XRD) are employed to estimate the chemical component analysis. The experimental results show that the sensitive films synthesized by the hydrothermal method can help the gas microsensors enhance the response due to a high surface-to-volume ratio and high pore density. The gas microsensors array chip has a high response and good selectively for detection of VOC gases. The response of VOC microsensors decreased as the relative humidity of the ambient increased. In the measurement of the gas microsensors integrated with the circuit, the ring oscillator circuit successfully converts the capacitance variation of the microsensors into the oscillation frequency output. The response of the gas microsensors integrated with the circuit is about 0.4-1.1 MHz/ppm. This study further measures the characteristics of the integrated gas microsensors array chip in an environment with multiple VOC gases (acetone, methanol, ethanol and ammonia). Measurement results demonstrate that these VOC microsensors can identify the target gases in multiple gas environments and realizes the objectives of real-time detection.

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Zhuang, Yu-Xiang, and 莊寓翔. "Development of Nanofiber-based Gas Microsensors by Using Electrospun Technology." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/49677804564614472572.

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碩士 逢甲大學 自動控制工程學系 103 The research presents the design of metal-oxide semiconductor gas microsensors based on MEMS technology and nano-properties for sensing CO gas. Sensitivity is defined by measuring the variation of resistance for sensing layers caused by Schottky contanct when gas specimens adsorb on the surface of sensing films. In2O3 nanofibers sensing film with heaters is fabricated by electrospinning, lithography and deep etching processes. The devices can increase effective sensing area for chemical reactions on which CO gas molecules can be adsorbed to improve operation process and response time. Fabrication parameters of indium oxide sensing films are discussed at different voltage, flow rate, collection distance, to perform optimal nanofibers. The sensitivity for sensing the concentration of CO gas is concluded. This sensor integrated the heater temperature sensor and carbon monoxide gas sensor, with characteristic measurements as a result, validation and production of micro gas sensor characteristics are discussed. The heater of the sensor when additional 60 V, the highest temperature can reach 162 ℃, temperature sensor response to linear its sensitivity is 2.09 Ω/℃, gas sensor optimal operating temperature is 160 ℃. Electrostatic spinning wire sensor, measurement of carbon monoxide concentration of 50 to 500 ppm, resistance rate of 1.082 to 1.804.

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Bücher zum Thema "Gas microsensors"

Al-Khalifa, Sherzad. Identification of a binary gas mixture from a single resistive microsensor. typescript, 2000.

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Advanced Nanomaterials for Inexpensive Gas Microsensors. Elsevier, 2020. http://dx.doi.org/10.1016/c2017-0-02009-8.

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Valero, Eduard Llobet. Advanced Nanomaterials for Inexpensive Gas Microsensors: Synthesis, Integration and Applications. Elsevier, 2019.

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Valero, Eduard Llobet. Advanced Nanomaterials for Inexpensive Gas Microsensors: Synthesis, Integration and Applications. Elsevier, 2019.

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Buchteile zum Thema "Gas microsensors"

Panda, Dhananjaya, and Koteswara Rao Peta. "FEM Analysis of Split Electrode IDTs Designed Lithium Tantalate-Polyaniline SAW Gas Sensor." In Microactuators, Microsensors and Micromechanisms. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-20353-4_20.

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Aguir, Khalifa. "Responses and Electrical Properties of Gas Microsensors." In Chemical Sensors and Biosensors. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118561799.ch7.

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Siegal, M. P., and W. G. Yelton. "Nanoporous-Carbon Coatings for Gas-Phase Chemical Microsensors." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-04-4.161.

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Penza, M., R. Rossi, M. Alvisi, et al. "Gas Microsensors with Metalloporphyrin-Functionalized Carbon Nanotube Networked Layers." In Lecture Notes in Electrical Engineering. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1324-6_15.

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Micheli, Adolph L., Shih-Chia Chang, and David B. Hicks. "Tin Oxide Gas Sensing Microsensors from Metallo-Organic Deposited (MOD) Thin Films." In Ceramic Engineering and Science Proceedings. John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320419.ch9.

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Rossi, R., M. Alvisi, G. Cassano, et al. "Tuned Sensing Properties of Metal-Modified Carbon-Based Nanostructures Layers for Gas Microsensors." In Lecture Notes in Electrical Engineering. Springer US, 2011. http://dx.doi.org/10.1007/978-1-4614-0935-9_20.

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Menini, Philippe. "Gas Microsensor Technology." In Chemical Sensors and Biosensors. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118561799.ch8.

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Debéda, Hélène, and Isabelle Dufour. "Resonant microcantilever devices for gas sensing." In Advanced Nanomaterials for Inexpensive Gas Microsensors. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-814827-3.00009-8.

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Llobet, Eduard. "Introduction." In Advanced Nanomaterials for Inexpensive Gas Microsensors. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-814827-3.00001-3.

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Hernandez-Ramirez, Francisco, Albert Romano-Rodriguez, and Joan Daniel Prades. "Inorganic nanomaterials." In Advanced Nanomaterials for Inexpensive Gas Microsensors. Elsevier, 2020. http://dx.doi.org/10.1016/b978-0-12-814827-3.00002-5.

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Konferenzberichte zum Thema "Gas microsensors"

Contaret, T., S. Gomri, J. L. Seguin, and K. Aguir. "Noise spectroscopy measurements in metallic oxide gas microsensors." In 2008 IEEE Sensors. IEEE, 2008. http://dx.doi.org/10.1109/icsens.2008.4716417.

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Bolotov, Valeriy V., Vladislav E. Roslikov, Egor V. Knyazev, Roman V. Shelyagin, Ekaterina A. Kurdyukova, and Dmitriy V. Cheredov. "Synthesis of nanocomposite CNT/SnOx for Gas microsensors." In 2010 11th International Conference and Seminar of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM 2010). IEEE, 2010. http://dx.doi.org/10.1109/edm.2010.5568669.

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Kozlov, A. G. "Thermal analysis of micro-hotplates for catalytic gas microsensors." In 2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2015. http://dx.doi.org/10.1109/eurosime.2015.7103094.

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Castro-Hurtado, Irene, Isabel Ayerdi, Enrique Castano, Angel Ma Gutierrez, and Juan Ramon Arraibi. "Microsensors for the multiparametric analysis of natural gas quality." In 2015 10th Spanish Conference on Electron Devices (CDE). IEEE, 2015. http://dx.doi.org/10.1109/cde.2015.7087482.

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Walton, Robin M., Richard E. Cavicchi, Stephen Semancik, et al. "Solid state gas microsensors for environmental and industrial monitoring." In Photonics East '99, edited by Tuan Vo-Dinh and Robert L. Spellicy. SPIE, 1999. http://dx.doi.org/10.1117/12.372861.

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Tomic, Milena, Isabel Gracia, Marc Salleras, Eduard Figueras, Carles Cane, and Stella Vallejos. "Gas Microsensors Based on Cerium Oxide Modified Tungsten Oxide Nanowires." In 2018 12th Spanish Conference on Electron Devices (CDE). IEEE, 2018. http://dx.doi.org/10.1109/cde.2018.8597067.

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Benkstein, K. D., A. Vergara, C. B. Montgomery, S. Semancik, and B. Raman. "Methods for optimizing and extending the performance of chemiresistive gas microsensors." In 2013 IEEE Sensors. IEEE, 2013. http://dx.doi.org/10.1109/icsens.2013.6688194.

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Ben Youssef, I., F. Sarry, O. Elmazria, et al. "Development of new polyurethanimide tailored copolymers for SO2 SAW gas microsensors." In 2010 IEEE Ultrasonics Symposium (IUS). IEEE, 2010. http://dx.doi.org/10.1109/ultsym.2010.5935523.

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Kozlov, A. G. "Modelling of thermal processes in catalytic gas microsensors implementing a measurement of combustible gas concentration." In 2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2016. http://dx.doi.org/10.1109/eurosime.2016.7463374.

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Xie, Haifen, Jiangsheng Wu, Peng Huang, Xinming Ji, and Yiping Hunag. "The study of the gas microsensors based on polymer-carbon black composites." In 2006 8th International Conference on Solid-State and Integrated Circuit Technology. IEEE, 2006. http://dx.doi.org/10.1109/icsict.2006.306399.

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Berichte der Organisationen zum Thema "Gas microsensors"

Grate, Jay W., and D. A. Nelson. Sorptive Polymers and Photopatterned Films for Gas Phase Chemical Microsensors and Arrays. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/15010066.

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Dr. Steve Semancik. Correlation of Chemisorption and Electronic Effects for Metal Oxide Interfaces: Transducing Principles for Temperature Programmed Gas Microsensors. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/791537.

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Semancik, Steve, Michael Tarlov, Richard Cavicchi, John S. Suehle, and Thomas J. McAvoy. Correlation of Chemisorption and Electronic Effects for Metal/Oxide Interfaces: Transducing Principles for Temperature-Programmed Gas Microsensors. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/833292.

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Semancik, Steve, Richard E. Cavicchi, and Thomas J. McAvoy. Correlation of Chemisorption and Electronic Effects for Metal/Oxide Interfaces: Transducing Principles for Temperature-Programmed Gas Microsensors. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/833296.

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S. Semancik, R. E. Cavicchi, D. L. DeVoe, and T. J. McAvoy. Correlation of Chemisorption and Electronic Effects for Metal Oxide Interfaces: Transducing Principles for Temperature Programmed Gas Microsensors (Final Report). Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/793127.

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CASALNUOVO, STEPHEN A., GREGORY CHARLES ASON, EDWIN J. HELLER, VINCENT M. HIETALA, ALBERT G. BACA, and S. L. HIETALA. The development of integrated chemical microsensors in GaAs. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/750935.

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Davis, Chad Edward, Michael Loren Thomas, Jerome L. Wright, et al. Potential application of microsensor technology in radioactive waste management with emphasis on headspace gas detection. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/919659.

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Hughes, R. C., and G. C. Osbourn. The final LDRD report for the project entitled: {open_quotes}Enhanced analysis of complex gas mixtures by pattern recognition of microsensor array signals{close_quotes}. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/393333.

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