Jiang Xin, Sun Xiaodong, Yin Di, Li Xiuling, Yang Ming, Han Xiaoxia, Yang Libin, Zhao Bing
College of Pharmacy, Jiamusi University, Jiamusi 154007, People's Republic of China.
Phys Chem Chem Phys. 2017 May 10;19(18):11212-11219. doi: 10.1039/c7cp01610g.
In this study, Au deposited TiO (Au-TiO) nanocomposites were prepared by photocatalytic reduction of Au species (HAuCl) on TiO nanoparticles (NPs) and served as efficient SERS-active substrates. The observed considerable SERS enhancement of 4-MBA molecules on Au-TiO NPs compared with that on pure TiO NPs can be attributed to the synergistic contribution of semiconductors and metals by the charge-transfer mechanism from the substrate to the molecule. In the preparation of Au-TiO nanocomposites, the photo-reduction time and concentration of HAuCl have an important influence on the SERS enhancement effect of the composite substrate. Moreover, for the recycle of substrates, the photocatalytic experiment of Au-TiO nanocomposites was carried out. The results show that these nanocomposite substrates are characterized by a self-cleaning property and can be repeatedly used in SERS experiments without losing their activity and with high stability.
在本研究中，通过在TiO纳米颗粒（NPs）上光催化还原金物种（HAuCl）制备了金沉积的TiO（Au-TiO）纳米复合材料，并将其用作高效的表面增强拉曼光谱（SERS）活性基底。与纯TiO NPs相比，在Au-TiO NPs上观察到的4-巯基苯甲酸（4-MBA）分子显著的SERS增强可归因于通过从基底到分子的电荷转移机制，半导体和金属的协同作用。在Au-TiO纳米复合材料的制备中，光还原时间和HAuCl的浓度对复合基底的SERS增强效果有重要影响。此外，为了基底的循环利用，进行了Au-TiO纳米复合材料的光催化实验。结果表明，这些纳米复合基底具有自清洁特性，可在SERS实验中重复使用而不丧失活性且具有高稳定性。
