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以Fe（NO3）3·9H2O2为源物质，乙二醇为溶剂，用Sol－gel法制备了平均粒径为10nm的γ-Fe2O3和掺Y2O3的γ-Fe2O3超细粉，并同时对样品的热稳定性、物相、微结构和气敏性能作了分析和测定．结果表明，掺入适量Y2O3后能使γ-Fe2O3的相变温度提高到775℃，这将使γ-Fe2O3基气敏元件的稳定性得到改善．两种超细粉制成的旁热式厚膜气敏元件对H2和CO几乎不敏感，而对C2H5OH、C2H2、液化石油气（LPG）和汽油则有较高的灵敏度．
Using Fe (NO3) 3 · 9H2O2 as the source material and ethylene glycol as the solvent, γ-Fe2O3 with an average particle size of 10 nm and γ-Fe2O3-doped γ2O3 powder were prepared by sol-gel method. Thermal stability, phase, microstructure and gas sensitivity were analyzed and determined. The results show that the phase transition temperature of γ-Fe2O3 can be increased to 775 ℃ by adding appropriate amount of Y2O3, which will improve the stability of γ-Fe2O3-based gas sensor. The two types of superfine powder side-heated thick-film gas sensors are almost insensitive to H2 and CO and have higher sensitivity to C2H5OH, C2H2, LPG and gasoline.