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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。
Based on the theory of conductance control, the thermal stability of γ-Fe2O3 microstructures such as yttrium-doped and sulfate ions, the sensitivity to benzene gas and the high selectivity to adjacent gases were systematically studied and analyzed. , And used DTA, TEM, RQ-1 and other methods for characterization and measurement. The results show that the phase transition temperature of γ-Fe2O3 can be increased to 618 ℃ by adding appropriate amount of Y2O3, so as to improve the thermal stability of γ-Fe2O3-based gas sensor. The proper doping of sulfate ions and gold ions is helpful to improve Benzene gas sensitive properties; γ-Fe2O3 matrix material micronization can enhance the γ-Fe2O3 surface gas sensing properties. Thus for the development of benzene-based organic gas sensor provides a new way.