【摘要】 使用溶胶-凝胶法制备了SnO2纳米颗粒.通过X射线衍射和扫描电子显微镜手段对材料的晶体结构和表面进行分析,结果表明所得材料为纯SnO2纳米颗粒.以所制备的SnO2纳米颗粒为气敏材料制备电阻式气敏元件,在CH4体积分数为2.5×10-4时,测试SnO2纳米颗粒对CH4气体的气敏特性,包括工作温度-气体灵敏度和响应-恢复特性,结果表明SnO2颗粒在工作温度为350℃时对CH4的最大灵敏度为11,响应-恢复时间分别为5 s和8 s.实验结果表明,该SnO2纳米颗粒气敏传感器对CH4具有快速响应和高灵敏度的特性,在工矿安全运行和环境保护方面具有重要的应用价值.更多还原

【Abstract】 SnO2 nanoparticles were synthesized by the sol-gel method,then the crystal structures and morphology of the nanoparticles were characterized by scanning electron microscopy and X-ray diffraction.The results show that these particles are pure SnO2 in the nanoscale range.Then these SnO2 nano-particles are used as source materials to make resistance type gas sensors.The gas sensitivity(referring to working temperature-sensitivity and response-recovery time) of the SnO2 nano-particles to CH4 at the volume fraction of 2.5×10-4 is tested at different working temperature.The results show that the highest sensitivity of SnO2 nano-particles at working temperature of 350 ℃ to CH4 is 11 and the response-recovery time is 5 s and 8 s,respectively.The experiment results show that the rapid response and high sensitivity of the gas sensor made from the SnO2 nano-particles has important utility value in the industrial safe operation and environmental protection.更多还原