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采用溶胶-凝胶法制备了不同配比的TiO2-SnO2纳米复合材料,以其作为气敏材料制备成旁热式气敏元件,研究了气敏元件在紫外光照下的气敏特性。结果表明,复合材料平均晶粒尺寸为19 nm,SnO2晶型为金红石型,气敏元件的电导在紫外光照下增加,对醇类有机挥发性气体的气敏灵敏度也显著提高,气敏元件的电阻、灵敏度均随TiO2含量的增加而增大。工作温度160℃时对乙醇气体的灵敏度为18,240℃时灵敏度为52,是无光照时的1.6倍,响应时间为5 s,恢复时间为9 s。
The TiO2-SnO2 nanocomposites with different ratios were prepared by sol-gel method. The gas-sensitive components were prepared as by-pass heat-sensitive gas sensors. The gas-sensing properties of the gas sensors under ultraviolet light were studied. The results show that the average grain size of the composite is 19 nm and the crystal form of SnO2 is rutile. The conductance of the gas sensing element increases under ultraviolet light, and the gas sensing sensitivity of the organic volatile gas also increases significantly. The resistance and the sensitivity increase with the increase of TiO2 content. At 160 ℃, the sensitivity to ethanol gas is 18, the sensitivity is 52 at 52 ℃, 1.6 times when no light is applied, the response time is 5 seconds and the recovery time is 9 seconds.