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.
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 Xray diffraction. The results show that these particles are pure SnOz 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.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第6期118-122,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(60036010,60476037)
陕西省科技厅工业攻关项目(2008K06-11).
