산화코발트 나노입자의 첨가에 따른 산화니켈 기반 반도체 산화물의 에탄올 가스 검출 특성 향상
Ethanol Gas Sensing Properties of NiO-based Composite Oxide Semiconductor with Co3O4 Nanoparticles
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NiO nanoparticles were synthesized by hydrothermal method for the application to ethanol gas sensor. They were composited with Co3O4 nanoparticles to improve the sensitivity to ethanol gas. Scanning electron microscopy revealed that the synthesized NiO nanoparticles were plate-shaped with the approximate size and thickness of 60 - 120 nm and 20 nm, respectively. On the other hand, Co3O4 nanoparticles mixed with NiO was observed to be spherical with the size range of 30 - 50 nm. The sensitivities of NiO sensors composited with Co3O4 nanoparticles at an optimal ratio of 8 : 2 were enhanced to approximately 1.44 - 1.79 times as high as those of as-synthesized NiO sensors for the ethanol concentration of 10 - 200 ppm at 200oC. The mechanism of the improved ethanol gas sensing of the NiO sensors composited with Co3O4 nanoparticles was discussed.
Abstract
NiO nanoparticles were synthesized by hydrothermal method for the application to ethanol gas sensor. They were composited with Co3O4 nanoparticles to improve the sensitivity to ethanol gas. Scanning electron microscopy revealed that the synthesized NiO nanoparticles were plate-shaped with the approximate size and thickness of 60 - 120 nm and 20 nm, respectively. On the other hand, Co3O4 nanoparticles mixed with NiO was observed to be spherical with the size range of 30 - 50 nm. The sensitivities of NiO sensors composited with Co3O4 nanoparticles at an optimal ratio of 8 : 2 were enhanced to approximately 1.44 - 1.79 times as high as those of as-synthesized NiO sensors for the ethanol concentration of 10 - 200 ppm at 200oC. The mechanism of the improved ethanol gas sensing of the NiO sensors composited with Co3O4 nanoparticles was discussed.
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