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In recent years, gas sensors have received considerable atten- tion driven by its practical applications in highly volatile and toxic gases detection. Among different sensor types, metal oxide semi- conductor (MOSs) gas sensors are the most popular type as it is more practical and market-oriented. A series of promising metal oxide, such as SnO2 , In2 O3 , ZnO, TiO2 , Fe2 O3 [6–10], and so on, has been used as sensing materials of gas sensors. They can test the toxic gases of ambient atmosphere through changes in the resistance of metal oxide. However, the gas response of single metal oxide is low. Recent researches to improve semiconductor oxide-based gas sensors are mainly based on two ways [11]. The first is doping rare metal oxides (PdO, NiO, CdO, etc. [12–14]) or noble metals (Au, Ag, Pt, Pd, etc. [15–18]). The second is to pre- pare composite sensing materials, such as binary or ternary metal oxides and organic-inorganic materials. For example, SnO2/ZnO
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