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中文摘要：
本文研究了对痕量甲醛气体敏感的SnO_2-NiO纳米材料的X射线光电子谱（XPS）.通过对XPS O1s和Sn3d5/2分峰的分析证实了SnO_2-NiO纳米材料是氧化态.在SnO_2-NiO纳米材料的表面观察到了SnO_2、SnO、NiO和Ni_2O_3,而以SnO_2为主要成分,NiO含量很低.由于掺杂了低浓度NiO使SnO_2-NiO纳米材料表面吸附氧的数量极大地增加,从而增加了材料表面反应活性点,进而使SnO_2-NiO纳米材料对痕量甲醛（HCHO）气体的气敏性能大大提高.
英文摘要：
In this paper,the XPS study of SnO_2-NiO nano-material sensitive to trace formaldehyde（ HCHO） gas is presented.The oxidation states of SnO_2-NiO material are confirmed by the shape analysis of corresponding XPS O1 s and Sn3d5 /2peaks using the decomposition prodecure.SnO_2、Sn O、NiO and Ni_2O_3 were observed on the surface of SnO2-NiO nano-material while SnO_2 was dominated and NiO was low.The quantity of adsorbed oxygen on the surface of SnO_2-NiO nano-material is greatly increased due to the NiO-doped.The gas-sensing property of SnO_2-NiO nano-material is greatly improved to HCHO.
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