【摘要】 用化学沉淀法和升温水解法合成了纯α─Ｆｅ２Ｏ３和ＳｎＯ２掺杂的α─Ｆｅ２Ｏ３，用ＸＲＤ和ＴＥＭ研究了掺杂方式对α─Ｆｅ２Ｏ３微观结构的影响，用静态气敏测试方法研究了掺杂方式对α─Ｆｅ２Ｏ３气体灵敏度和电阻的影响结果表明：水解法α─Ｆｅ２Ｏ３颗粒微细（～４０ｎｍ），阻值适中（数百ｋΩ），而且气体灵敏度高更多还原

【Abstract】 ?Fe2O3 and SnO2 doped α-Fe2O3 were made by chemical precipitation and hydrolysis. Effects of doping methods on microstructure of α-Fe2O3 were studied with XRD and TEM. Effects of doping methods on gas sensitivity and resistance of α-Fe2O3 were tested with static method of gas-sensing measuring. The results show that 2wt%SnO(2-)-α-Fe2O3 obtained by hydrolysis is of high gas sensitivity(12 times for 2kppm C4H(10)), proper working resistance (105-106Ω) and small particle size (1-40nm).更多还原