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以尿素水解法制得平均粒径为２７．７ｎｍ，比表面为６０．２ｍ２／ｇ的掺锡的α－氧化铁粉体，以该粉体为气敏材料制成的元件在最佳加热电流条件下对乙炔、异丁烷、氢气、一氧化碳、氨气等气体的气敏特性测试结果表明，掺锡有不同程度的增感作用，且降低了元件的最佳加热电流，缩短了响应－恢复时间，同时，从电导－温度曲线与比表面值，初步探讨了该材料的气敏机理为表面电阻控制型。
Urea-hydrolyzed method to obtain an average particle size of 27.7nm, the specific surface of the iron-doped α-iron oxide powder 60.2m2 / g powder, the powder is made of gas-sensitive material in the optimal heating current conditions Gas sensitivities of acetylene, isobutane, hydrogen, carbon monoxide and ammonia were tested under different gas sensitivities. The results showed that the tin sensitizing effect was improved to some extent and the best heating current was reduced and the response-recovery time At the same time, the gas sensing mechanism of the material is discussed as the surface resistance control type from the conductance-temperature curves and specific surface values.