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Effects of Oxygen and Carbon Monoxide Species on the Gas Sensing Properties of SnO2 Nanoparticles

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The relationships between sensing signal of SnO2 and the concentration of target gas at different gas backgrounds are studied in this paper. The detailed studies revealed that the current response under N2 gas was greater than the mixed gases of N2 and CO at 200 °C. However, this phenomenon was reversed at higher temperature (above 200 °C). Thus, it was found that 200 °C is the optimum temperature for the best sensing performance. The surface chemical reaction was also investigated and it was found that the electrons produced by reaction of CO and adsorbed oxygen is much smaller than that produced by reaction of CO and lattice oxygen at 400 °C. Therefore, it was concluded that the oxygen adsorption is mainly to form a grain boundary barrier and it is not the main reactant for sensing measured at 400 °C.
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Keywords: GAS SENSITIVITY; SNO2 NANOPARTICLES; SURFACE CHEMICAL REACTION

Document Type: Research Article

Publication date: August 1, 2017

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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