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Multiwalled carbon nanotubes(MWNTs)were synthesized through CVD method,and the gas sensitive materials MWNTs/ZnO were obtained by mixing MWNTs and ZnO.The gas sensing properties of the as-prepared materials were investigated.The results show that the gas sensing properties of ZnO sensor are significantly improved by doping MWNTs.The sensitivity,response time and recovery time to 50 ppm ethanol at 260°C are 46,4 and 20 s,respectively.We also examined the selectivity of 0.1 wt%MWNTs-doped ZnO sensors to different gases.The results show that the sensor possesses an excellent selectivity to ethanol.
Multiwalled carbon nanotubes (MWNTs) were synthesized through CVD method, and the gas sensitive materials MWNTs / ZnO were obtained by mixing MWNTs and ZnO. The gas sensing properties of the as-prepared materials were investigated. The results show that the gas sensing properties of ZnO sensors are significantly improved by doping MWNTs. The sensitivity, response time and recovery time to 50 ppm ethanol at 260 ° C are 46,4 and 20 s, respectively. We also examined the selectivity of 0.1 wt% MWNTs-doped ZnO sensors to different gases.The results show that the sensor possesses an excellent selectivity to ethanol.