论文部分内容阅读
以碳纳米管(carbon nanotubes,CNT)为模板,在超声波辅助条件下,利用溶胶–凝胶法合成CNT–In2O3纳米复合粉体,用该复合粉体制备CNT–In2O3气敏元件。借助X射线衍射、透射电子显微镜、傅立叶变换红外光谱仪和能量色散谱仪对产物进行表征,研究了CNT–In2O3气敏元件的气敏性。结果表明:CNT–In2O3纳米复合粉体是一种由In2O3纳米颗粒均匀包裹在直径约为20～30 nm的碳纳米管上的纳米复合材料。CNT–In2O3气敏元件在低温对NO2有较高的灵敏度,该元件对NO2的灵敏度高于纯In2O。当CNT和InC13.4H2O的摩尔比为3:10时,CNT–In2O3气敏元件对NO2的灵敏度最大,且灵敏度随NO2浓度的增大而增大。该气敏元件在200℃时对NO2的响应时间为10 s,恢复时间为70s。
CNT-In2O3 nano-composite powder was synthesized by sol-gel method with carbon nanotubes (CNTs) as a template under ultrasound-assisted condition. The CNT-In2O3 gas sensor was prepared by using the composite powder. The products were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy and energy dispersive spectroscopy. The gas sensitivities of CNT-In2O3 gas sensors were studied. The results show that CNT-In2O3 nanocomposite is a kind of nanocomposite which is uniformly coated with In2O3 nanoparticles on carbon nanotubes about 20-30 nm in diameter. The CNT-In2O3 gas sensor has higher sensitivity to NO2 at low temperature, and the element is more sensitive to NO2 than pure In2O. When the molar ratio of CNT to InC13.4H2O is 3:10, the sensitivity of CNT-In2O3 gas sensor to NO2 is the highest, and the sensitivity increases with the increase of NO2 concentration. The response time of the gas sensor to NO2 at 200 ℃ is 10 s, and the recovery time is 70 s.