摘要
从电导控制理论,对掺钇、硫酸根离子等多元化、微结构γ-Fe2O3的热稳定性、响应苯类气体敏感性及其对相邻气体的高选择性,进行了系统研究与机理分析,并用DTA、TEM、RQ-1等方法进行表征与测量。结果表明,掺入适量Y2O3后能使γ-Fe2O3的相变温度提高到618℃,从而改善γ-Fe2O3基气敏元件的热稳定性;硫酸根离子和金离子的适量掺杂有助于提高苯类气体的敏感特性;γ-Fe2O3基体材料的微细化可增强γ-Fe2O3的表面气敏特性。从而为苯类有机气体敏感元件研制提供了一条新途径。
The conductance control theory was used to investigate and analyze the p roperties of mini -structureγ-Fe 2 O 3 adding with Y or SO 42- ,such as heat stability,sensitivit y to benzene hydrocarbon gases and high selectivity to simila r gases.DTA,TEM and RQ -1instrument were used to characterize the properties ofγ-Fe 2 O 3 material.The result suggest approp riate doping of Y 2 O 3 can make the phase change temperature ofγ-Fe 2 O 3 up to 618℃,which can improve the thermal stability ofγ-Fe 2 O 3 based sensitive elements.Appropriate doping of SO 42- and Au + can contribute to improve the sensit ive properties to benzene hydrocarbon g ases.Ultrafineγ-Fe 2 O 3 based materials reinforce the surfa ce sensitive mechanism.So a new approa ch is obtained to develop sensitive e lements response to benzene hydrocarbon gases.
