纳米CuO-SnO_2气敏粉体的制备及气敏特性研究

Preparation of CuO-SnO_2 Gas Sensor and Its Sensitive Effect

用Sol-Gel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Sol-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。

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.