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采用SnCl2溶液法制备二氧化锡包覆多壁碳纳米管(SnO2coated multi-wall carbon nanotubes,SnO2/MWCNTs),研究了SnO2/MWCNTs的室温氢敏性能。SEM和TEM形貌观察表明:粒径5nm的SnO2均匀包覆在MWCNTs表面,并形成连续的包覆层。氢敏性能测试表明:SnO2/MWCNTs材料具有室温氢敏性能,可以实现体积浓度0.01%氢气的检测。在对0.1%氢/氩混合气的室温氢敏测试中发现,当通入空气后出现电流反向波动的现象,这是由于空气中的O2与样品周围的H2生成H2O并吸附在SnO2表面,降低了SnO2/MWCNTs的电阻,随后由于O的竞争吸附,HO又脱附所导致。这一电流反向波动现象暗示SnO/MWCNTs具有室温湿敏性能。
SnO2 / MWCNTs coated with tin dioxide were prepared by SnCl2 solution. The hydrogen sensitivity of SnO2 / MWCNTs at room temperature was investigated. SEM and TEM observations showed that SnO2 with a diameter of 5 nm uniformly coated on the surface of MWCNTs and formed a continuous coating. Hydrogen-sensitive performance tests show that: SnO2 / MWCNTs materials with hydrogen-sensitive properties at room temperature, the volume concentration of 0.01% hydrogen can be detected. In the room temperature hydrogen sensitivity test of 0.1% hydrogen / argon mixture, it was found that when the air is introduced, the current reversely fluctuates. This is because O2 in the air and H2 around the sample generate H2O and adsorb on the surface of SnO2, The resistance of the SnO2 / MWCNTs is reduced, and then the HO desorbs due to competitive adsorption of O. This reverse current fluctuation implies that the SnO / MWCNTs have room-temperature moisture sensitivity.