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采用化学方法合成了气体灵敏度和选择性良好的r-Fe_2O_3 微细粉末,并且利用化学共沉淀的方法合成了具有不同气敏性能的过渡金属氧化物(MnO,NiO,ZnO)掺杂的r-Fe_2O_3气敏材料,这些材料的颗粒≤0.1um.过渡金属氧化物掺杂可以改变r-Fe_2O_3气敏材料的陶瓷微结构,但不宜用来改善r-Fe_2O_3的相稳定性.通过掺杂可以改变r-Fe_2O_3气敏材料的选择性和灵敏度.r-Fe_2O_3是以体控制型为主的气敏机制.过渡金属氧化物掺杂的r-Fe_2O_3对C_2H_5OH,C_2H_2和LPG具有良好的选择性和较高的灵敏度.
The gas sensitized and finely-selected r-Fe 2 O 3 fine powders were synthesized by chemical methods and the r-Fe 2 O 3 doped with transition metal oxides (MnO, NiO, ZnO) with different gas sensing properties was synthesized by chemical coprecipitation Gas-sensing materials, these materials particles ≤ 0.1um. Transition metal oxide doping can change the r-Fe_2O_3 gas-sensitive ceramic material microstructure, but should not be used to improve the phase stability of r-Fe_2O_3 by doping can change the r -Fe_2O_3 gas sensing materials.r-Fe_2O_3 is a gas-sensing mechanism dominated by bulk control.The transition metal oxide doped r_Fe_2O_3 has good selectivity and high selectivity to C_2H_5OH, C_2H_2 and LPG Sensitivity.