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ZnO nanowires were synthesized and annealed at various temperatures of <TEX>500-800∘C</TEX> in oxygen atmosphere to investigate hydrogen gas sensing properties. The diameter and length of the synthesized ZnO nanowires were approximately 50-100 nm and a few <TEX>10s\;μm</TEX>, respectively. <TEX>H₂</TEX> gas sensing performance of the ZnO nanowires sensor was measured with electrical resistance changes caused by <TEX>H₂</TEX> gas with a concentration of 0.1-2.0%. The response of ZnO nanowires at room temperature to 2.0% <TEX>H₂</TEX> gas is found to be two times enhanced by annealing process in <TEX>O₂</TEX> atmosphere at <TEX>800∘C</TEX>. In the current study, the effect of heat treatment in <TEX>O₂</TEX> atmosphere on the gas sensing performance of ZnO nanowires was studied. And the underlying mechanism for the sensing improvement of the ZnO nanowires was also discussed.
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Wooseung Kang (2017) studied this question.
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