Journal ArticleDOI
Oxide semiconductor gas sensors
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TLDR
In this paper, the three key requirements of sensor design are determined by considering each of these three key factors: selection of a base oxide with high mobility of conduction electrons and satisfactory stability (transducer function), selection of foreign receptor which enhances surface reactions or adsorption of target gas (receptor function), and fabrication of a highly porous, thin sensing body (utility factor).Abstract:
Semiconductor gas sensors utilize porous polycrystalline resistors made of semiconducting oxides. The working principle involves the receptor function played by the surface of each oxide grain and the transducer function played by each grain boundary. In addition, the utility factor of the sensing body also takes part in determining the gas response. Therefore, the concepts of sensor design are determined by considering each of these three key factors. The requirements are selection of a base oxide with high mobility of conduction electrons and satisfactory stability (transducer function), selection of a foreign receptor which enhances surface reactions or adsorption of target gas (receptor function), and fabrication of a highly porous, thin sensing body (utility factor). Recent progress in sensor design based on these factors is described.read more
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Nanoscale metal oxide-based heterojunctions for gas sensing: A review
TL;DR: In this paper, the dominant electronic and chemical mechanisms that influence the performance of metal-oxide-based resistive-type gas sensors are discussed, including p-n and n-n potential barrier manipulation, n-p-n response type inversions, spillover effects, synergistic catalytic behavior, and microstructure enhancement.
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Metal and Metal Oxide Nanoparticles in Chemiresistors: Does the Nanoscale Matter?
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Metal Oxide Semi-Conductor Gas Sensors in Environmental Monitoring
TL;DR: The nature of the gas response and how it is fundamentally linked to surface structure is explored and Synthetic routes to metal oxide semiconductor gas sensors are discussed and related to their affect on surface structure.
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Metal Oxide Nanostructures and Their Gas Sensing Properties: A Review
TL;DR: The gas sensing properties of metal oxide nanostructures assembled by nanoparticles are reviewed in this article and the effect of doping is summarized and the perspectives ofMetal oxide gas sensor are given.
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References
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Journal ArticleDOI
Grain size effects on gas sensitivity of porous SnO2-based elements
TL;DR: In this paper, the effects of grain size on gas sensitivity were investigated by using porous sintered SnO2 elements fabricated with pure and impurity-doped SnO 2 elements.
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A New Detector for Gaseous Components Using Semiconductive Thin Films.
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Interactions of tin oxide surface with O2, H2O AND H2
TL;DR: In this paper, the authors investigated the interaction of tin oxide surface with oxygen, water vapor, and hydrogen using temperature-programmed desorption (TPD) chromatograms of oxygen.
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Theory of gas-diffusion controlled sensitivity for thin film semiconductor gas sensor
TL;DR: In this article, a diffusion equation was formulated by assuming that an inflammable gas (target gas) moves inside the film by Knudsen diffusion, while it reacts with the adsorbed oxygen following a first-order reaction kinetic.
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Electronic Interaction between Metal Additives and Tin Dioxide in Tin Dioxide-Based Gas Sensors
TL;DR: In this article, the electronic interaction of SnO2 with Ag and Pd particles dispersed on its surface was examined by means of X-ray photoelectron spectroscopy (XPS).