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采用浸渍提拉法将预先合成的TiO2溶胶均匀涂覆在玻璃表面制膜,并在膜表面负载上具有高表面增强拉曼散射(SERS)活性的Au纳米粒子,获得Au/TiO2多功能薄膜。通过X射线衍射(XRD)、扫描电镜(SEM)、紫外可见吸收光谱(UV-vis)、拉曼(Raman)等表征手段,考察了Au/TiO2薄膜的结构、形貌与性能。所得Au/TiO2薄膜在UV灯辐照下可有效地降解罗丹明B等染料分子,其中Au粒子有效抑制了薄膜表面光生电子-空穴的复合,增强了光生载流子的分离效率,提高了薄膜的光催化性能。同时拉曼实验表明,Au/TiO2薄膜也是一种优秀的SERS检测基底。更为重要的是,Au/TiO2薄膜可通过UV灯照射“清洗”掉薄膜表面吸附的上组SERS实验中的检测分子,实现基底的循环利用,有望解决传统SERS基底一次性使用的缺陷。
Au nanoparticle with high surface-enhanced Raman scattering (SERS) activity was coated on the surface of glass by dip-coating method. The pre-synthesized TiO2 sol was uniformly coated on the glass surface to obtain the Au / TiO2 multifunctional film. The structure, morphology and properties of Au / TiO2 films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis and Raman spectroscopy. The obtained Au / TiO2 thin film can effectively degrade rhodamine B and other dye molecules under UV lamp irradiation. The Au particles effectively inhibit photo-electron-hole recombination on the film surface and enhance the separation efficiency of photo-generated carriers, Photocatalytic properties of thin films. At the same time Raman experiments show that, Au / TiO2 film is also an excellent SERS detection substrate. More importantly, the Au / TiO2 film can detect the molecules in the SERS experiment of the upper group adsorbed on the surface of the film by the UV lamp to “recycle” the substrate so as to be able to solve the defects of the traditional SERS substrate such as single use .