采用电沉积和旋转涂膜相结合的方法成功制备了高度有序的TiO2/Au纳米棒阵列催化剂.扫描电镜和透射电镜结果表明,TiO2薄膜均匀地包覆在Au纳米棒的表面,形成核壳型的一维阵列结构.X射线衍射分析表明所获得TiO2为(101)晶面优先生长的锐钛矿晶相.紫外-可见漫反射光谱显示,由于Au和TiO2间肖特基结的存在造成吸收红移,Au纳米棒表面的等离子共振效应导致400～800 nm间出现吸收峰.在紫外光催化降解罗丹明B反应中,TiO2/Au纳米棒阵列催化剂表现出优异的催化活性,其动力学常数分别为TiO2和TiO2/Au膜的2.0和1.3倍.这主要归结于Au与TiO2间的肖特基结和一维阵列结构所带来的大的比表面积、宽的光响应范围和有效的光生载流子分离与传递.
A highly ordered TiO2/Au nanorod array was successfully fabricated by direct current electrodeposition and subsequent spin-coating.Scanning electron microscopy and transmission electron microscopy images revealed that the TiO2 film completely covered the surface of the Au nanorods,which resulted in TiO2 shell Au core nanorods.X-ray diffraction patterns revealed that the TiO2 film was anatase with preferential orientation in the (101) plane.UV-Vis diffuse reflectance spectra showed a shift in the absorption edge toward the visible region because of the formation of a Schottky junction between Au and TiO2.A new absorption peak that ranged from 400 to 800 nm appeared because of the localized surface plasmon resonance of the Au nanorod arrays.For the photocatalytic degradation of rhodamine B under UV light irradiation,the TiO2/Au nanorod array exhibited excellent photocatalytic activity and its kinetic constant was 2.0 times that of pristine TiO2 and 1.3 times that of a TiO2/Au film.The enhanced photocatalysis was attributed to the high surface volume ratio,an improved UV light response,efficient separation,and the convenient migration of photogenerated charge carriers because of the one-dimensional nanorod structure and the Schottky junction between Au and YiO2.This work could provide new insights into the fabrication of a high performance photocatalyst and thus facilitate practical environmental applications.
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