Co3O4 나노입자가 코팅된 In2O3 나노와이어의 에탄올 가스 검출 특성
Ethanol Gas Sensing Properties of In2O3 Nanowires Coated with Co3O4 Nanoparticles
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초록
In2O3 nanowires were coated with Co3O4 nanoparticles to investigate the improvement of ethanol gas sensing performance compared with as-synthesized In2O3 nanowires. Scanning electron microscopy showed that the nanowires synthesized by VLS mechanism had diameters and lengths of approximately 50-100 nm and a few micrometers, respectively. Co3O4 nanoparticles produced by hydrothermal method was in the size range of a few to a few tens nm. As-synthesized and Co3O4 nanoparticles coated In2O3 nanowires sensors exhibited responses of 1.96% and 4.57%, respectively for the ethanol gas concentration of 200 ppm at 200oC. The underlying mechanism for the improved responses of Co3O4 nanoparticles coated In2O3 nanowires sensors is discussed.
Abstract
In2O3 nanowires were coated with Co3O4 nanoparticles to investigate the improvement of ethanol gas sensing performance compared with as-synthesized In2O3 nanowires. Scanning electron microscopy showed that the nanowires synthesized by VLS mechanism had diameters and lengths of approximately 50-100 nm and a few micrometers, respectively. Co3O4 nanoparticles produced by hydrothermal method was in the size range of a few to a few tens nm. As-synthesized and Co3O4 nanoparticles coated In2O3 nanowires sensors exhibited responses of 1.96% and 4.57%, respectively for the ethanol gas concentration of 200 ppm at 200oC. The underlying mechanism for the improved responses of Co3O4 nanoparticles coated In2O3 nanowires sensors is discussed.
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