The nanoparticle TiO2 powder with anatase structure was prepared by sol-gel method, and it was doped with 1-Sat% copper as a catalyst for hydrogen adsorption, and the doping copper exists as CuO form. The average particle size was about 50 nm. In the hydrogen partial pressure 1 000×10^-6/H2/Ar, the resistance of the nano-TiO2 doped or undoped copper were measured in the temperature range 100-500℃ with or without hydrogen respectively. The results showed that the resistance of the nano-TiO2 by doping copper was more sensistive for hydrogen than that of pure TiO2 in the temperature range of 100-500℃. The sensitivity of the nano-TiO2 by doping copper for hydrogen was increased about 50 %. The relationship between the sensitivity and the operating temperature and response time of the gas-sensor material for hydrogen was also researched. The results showed that there was a maximum sensitivity and the fastest response time for hydrogen at about 400℃. The catalyst mechanism of the nano-TiO2 by doping copper for hydrogen was discussed. The reduce reaction between CuO and the adsorption hydrogen was regarded as the main reason to increase the hydrogen senstivity of the nano-TiO2.
修改评论