纳米CuO-SnO2 气敏粉体的制备及气敏特性研究

用So l-Ge l 法制备了纳米级的CuO -SnO₂ 气敏粉体, 所得粉体制作的气敏元件有较好的气敏性能。在不同的加热电压下进行实验研究, 对不用浓度配比制成的气敏元件进行气敏性能测试。通过对所得粉体的表征可知, 用So l-Gel 法制备出的CuO-SnO₂ 气敏粉体是纳米级的, 比表面积大, 活性好, 其最佳热处理温度为650 ℃, 测试结果得出CuO 摩尔分数为4 %的CuO-SnO₂ 气敏元件有较好的灵敏度和较高的选择性, 并且对CO₂ 的灵敏度和选择性比较突出。

Preparation of CuO-SnO2 Gas Sensor and Its Sensitive Effect

The CuO doped SnO2 nanocrystalline powders were prepared by the Sol-Gel method,which were used to manufacture gas sensors with good gas-sensing characterization.Treatment at different temperature was investigated.The gas sensitive effect on gas had been measured to the powders which had different concentrations.The results show that the prepared nano-sized powders have large specific surface area,high surface activation and the rational annealing temperature is 650 ℃,SnO2 gas sensors doped 4%(molar fraction) CuO have high sensitivity and high selectivity especially for greenhouse gas CO2.