The composite SnO₂/CuO nanotubes are prepared by uniaxial electrospinning. By controlling the molar ratio of tin to copper, SnO₂/CuO nanotubes (F-1, molar ratio 1:1) and nanofibers (F-1, molar ratio 1:2) samples are prepared, respectively. The experimental results show that the composite SnO₂/CuO nanotubes have excellent selectivity for ethanol, the response to ethanol at the same concentration and temperature is three times that of other gases, the saturated concentration of ethanol gas is 250 ppm and 300 ppm respectively, the optimal working temperature is 340 ℃ and the response value has a good linear relationship with the ethanol concentration between 25 and 300 ppm. The response value of F-1 is higher than that of F-2 in the same concentration of ethanol. The response value of the gas sensor based on F-1 to 250 ppm ethanol reaches 8.8 at 340 ℃, and its response and recovery time are 6 and 10 s respectively. The gas sensing mechanism of the material is explained by using the theory of electron depletion layer and barrier height, which is the basis of our follow-up work.

通过单轴静电纺丝制备复合SnO ₂ /CuO纳米管。通过控制锡与铜的摩尔比，分别制备了SnO ₂ /CuO纳米管（F-1，摩尔比1:1）和纳米纤维（F-1，摩尔比1:2）样品。实验结果表明，复合SnO ₂/CuO纳米管对乙醇具有优异的选择性，对乙醇在相同浓度和温度下的响应是其他气体的3倍，乙醇气体的饱和浓度分别为250 ppm和300 ppm，最佳工作温度为340 ℃，响应值与乙醇浓度在 25 至 300 ppm 之间具有良好的线性关系。在相同乙醇浓度下，F-1的响应值高于F-2。基于F-1的气体传感器对250 ppm乙醇的响应值在340 ℃时达到8.8，其响应时间和恢复时间分别为6 s和10 s。利用电子耗尽层和势垒高度理论解释了材料的气敏机理，这是我们后续工作的基础。