通过水热处理TiO₂纳米管阵列和氧化石墨烯制备石墨烯/TiO₂纳米管薄膜材料，并进一步连续离子沉积BiOBr来制备BiOBr/石墨烯/TiO₂纳米管阵列薄膜材料。利用X射线衍射仪、扫描电子显微镜、X射线电子能谱和紫外-可见漫反射光谱等测试手段对所得样品的物相组成、表面形貌及元素形态和光吸收性能等进行表征。结果表明，TiO₂纳米管的表面成功负载了石墨烯和BiOBr纳米片。紫外-可见漫反射吸收光谱表明，BiOBr和石墨烯共同修饰的TiO₂纳米管的吸收带边发生明显红移，其可见光吸收性能明显提高。光电电化学性能测试表明，BiOBr和石墨烯的共同修饰有效提高了TiO₂纳米管的光电流、光电压和光电转换效率。

Graphene/TiO₂ nanotube array film materials,prepared by hydrothermal treatment of TiO₂ nanotube arrays and graphene oxide,are further decorated with BiOBr via a successive ion deposition to construct BiOBr/graphene/TiO₂,a kind of ternary composite nanotube array film materials.The phase composition,surface morphology,chemical states of elements and optical adsorption property of the as-prepared samples are characterized by X-ray diffractometry (XRD),scanning electron microscopy (SEM),X-ray electron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS).The results disclose that graphene and BiOBr nanosheets are successfully loaded on the surface of TiO₂ nanotube arrays.A red-shift of the absorption edge and enhanced light absorption intensity in the UV-Vis DRS are observed for the prepared BiOBr/graphene/TiO₂ nanotube arrays in comparison with TiO₂ nanotube arrays and graphene/TiO₂ nanotube arrays.Moreover,the photoelectrochemical and electrochemical detection results indicate the co-modification of BiOBr and graphene improves the photocurrent,open circuit potential,and photo-conversion efficiency of TiO₂ nanotube.

苑小娇(1991-),女,硕士研究生,主要研究方向为先进功能材料的制备及光电化学和光催化性能研究,yuanxiaojiao0713@163.com