N掺杂TiO_2纳米管阵列的制备与性质研究

本文采用阳极氧化法制备了孔径为60-80nm,孔壁厚约为20-30nm的高有序度TiO2纳米管。将制备的TiO2纳米管经表面酸化后在浓氨水中浸泡,并于氮气气氛中进行退火处理,以实现TiO2纳米管的N掺杂。利用SEM、XRD、Raman和XPS对样品的形貌与结构进行了研究。结果显示,掺N后不会破坏阳极氧化形成的高有序纳度米管阵列,而且N的引入促进了TiO2纳米管在低温下由锐钛矿相向金红石相的转变。N掺杂样品的XPS中出现了结合能位于399.7 eV的峰,该峰来源于TiO2的间隙氮杂质,显示此方法在TiO2纳米管中实现了有效的N的掺杂。

Preparation and Properties of Nitrogen-Doped Titania Nanotube Arrays

Highly ordered nanotubes with diameter of 60~80 nm,wall thickness of 20~30 nm were obtained by anodic oxidizing method.Nitrogen doped titania nanotubes were synthesized by surface acidification and aqueous ammonia soaking of the anodized titania nanotubes,followed by annealing in nitrogen.And the morphologies and crystal structure of both doped and undoped samples were studied.The ordered structure of titania nanotubes maintained after the nitrogen doping process,as is evidenced by SEM observations.Detailed structural analysis revealed that nitrogen doping may have facilitated the phase transition of titania nanotube from anatase to rutile.The effective doping of nitrogen into titania nanotubes was evidenced by the occurrence of N1s peak of the nitrogen doped titania nanotubes in XPS with a binding energy of 399.7 eV,which was attributed to the interstitial nitrogen dopant in the anatase lattice.