【摘要】 用溶胶凝胶(sol-gel)法制备了纳米SnO2材料。材料的平均粒径为15 nm。制作了旁热式甲醛气敏元件,对不同气体体积分数、不同温度下元件的灵敏度以及元件的响应恢复时间进行了测试。试验证明:元件工作的最佳加热电压为2.5 V,元件的响应时间约为25 s,恢复时间约为40 s。更多还原

【Abstract】 Nanocrystalline tin oxide powder is prepared by sol-gel method.The average grain size of SnO₂ is（15 nm）.Heater type gas sensor for formaldehyde is made.The sensitivity under different gas volume fraction and temperatures are measured,and also,the response and recovery time are measured.The experiment shows that the best heating voltage is 2.5 V.The response time is about 25 s,and the recovery time is about 40 s.更多还原