采用溶胶-凝胶法,在电场热处理条件下,合成了晶粒度为50～60 nm的在可见光下具有较高催化活性的一种掺N的TiO_2薄膜.光催化实验表明:在可见光催化下,掺N薄膜对甲基橙溶液的催化活性大大提高了.通过XPS和XRD分析,确定了N在TiO_2中以取代O原子的形式存在,即薄膜中形成了非整比化合物TiO_(2-x)N_x,通过紫外可见光谱(UV-VIS)分析测试薄膜的透光率,观察到掺N薄膜的吸收截止波长为550 nm,说明吸收边发生了红移.以取代形式掺杂的N在窄化带隙和提高光催化活性方面具有重要的意义.
The N-doping TiO_2 thin film with the grain size of 50～60 nm was synthesized by sol-gel process in electric field,it is a high visible-light-active photocatalyst. The result of the photocatalytic experiment showed that the N-doping film's vis-activity to the methyl orange rose largely. XPS and XRD analysis supplied that the doping N substituted the oxygen-deficient in TiO_2 film and the TiO_(2-x)N_x compound appeared. The Einstein shift in optical absorption spectrum of the N-doped film was also observed by the UV-VIS, and the cut wave length was about 550 nm. It is concluded that the N doping is effective to narrow the gap and enhance the photo catalysis.
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