中文摘要：

采用电子束热蒸发镀膜技术,制备TiO2/Au/WO3三明治复合薄膜.借助X射线衍射仪（XRD）、透射电子显微镜（TEM）、吸收光谱仪（UV-Vis）和电化学工作站对薄膜相结构、表面形貌以及光电化学性能进行了研究.研究结果表明：相比较于纯TiO2薄膜以及TiO2/WO3复合薄膜,TiO2/Au/WO3复合薄膜的光电流密度有所增加.当Au的厚度是2nm时,复合薄膜在全光谱下和紫外光的照射下光电流最大,金属的作用是电子陷阱,并抑制了载流子的复合.当Au薄膜的厚度增加到4nm时,在可见光的作用下TiO2/4nm-Au/WO3光电流达到了3.5μA/cm2,这主要是由于Au颗粒的表面等离激元共振效应（LSPR）.

英文摘要：

TiO2/Au/WO3 sandwich composite films were prepared by e-beam evaporation. The samples were characterized by X-ray diffraction（ XRD）,transmission election microscope（ TEM）,UV-Vis diffuse reflectance spectroscope and electrochemical workstation. It is found that the TiO2/Au/WO3 composited film shows enhanced photocurrent density compared with the pure TiO2 film and the TiO2/WO3 film. When the thickness of the Au film is 2 nm,the photocurrent density of the TiO2/Au/WO3 composited film is the highest under illumination of white light and UV light. We believe that Au acts as an ＂electrons sink＂. When the thickness of the Au film is 4 nm,the photocurrent density of the TiO2/Au/WO3 composited film is the highest under illumination of visible light,which results from the LSPR of Au.