상온에서 UV 활성화된 ZnS 나노와이어의 NO2 가스 검출 특성
NO2 gas sensing properties of UV activated ZnS nanowires at room temperature
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ZnS nanowires were synthesized in order to investigate NO2 gas sensing properties. They were grown on the sapphire substrate using ZnS powders. SEM (scanning electron microscopy) showed the diameter and length of the ZnS nanowires were approximately in the range of 50 - 100 nm and a few 10s μm, respectively. They were also found to be composed of Wurtzite- structured single crystals from TEM (transmission electron microscopy) analysis. NO2 gas sensing performance of the ZnS nanowire was measured with electrical resistance changes caused by NO2 gas with a concentration of 1-5ppm. The sensor was UV treated with an intensity of 1.2 mW/cm2 to facilitate charge carrier transfer. The responses of the ZnS nanowires to the NO2 gas atroom temperature, treated with UV of two different wavelengths of 365 nm and 254 nm, are measured to be 124.53 - 206.87 % and 233.97 - 554.83%, respectively. In the current work, the effect of UV treatment on the gas sensing performance of the ZnS nanowires was studied. And the underlying mechanism for the electrical resistance changes of the ZnS nanowires by NO2 gas was also discussed.
Abstract
ZnS nanowires were synthesized in order to investigate NO2 gas sensing properties. They were grown on the sapphire substrate using ZnS powders. SEM (scanning electron microscopy) showed the diameter and length of the ZnS nanowires were approximately in the range of 50 - 100 nm and a few 10s μm, respectively. They were also found to be composed of Wurtzite- structured single crystals from TEM (transmission electron microscopy) analysis. NO2 gas sensing performance of the ZnS nanowire was measured with electrical resistance changes caused by NO2 gas with a concentration of 1-5ppm. The sensor was UV treated with an intensity of 1.2 mW/cm2 to facilitate charge carrier transfer. The responses of the ZnS nanowires to the NO2 gas atroom temperature, treated with UV of two different wavelengths of 365 nm and 254 nm, are measured to be 124.53 - 206.87 % and 233.97 - 554.83%, respectively. In the current work, the effect of UV treatment on the gas sensing performance of the ZnS nanowires was studied. And the underlying mechanism for the electrical resistance changes of the ZnS nanowires by NO2 gas was also discussed.
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