论文列表
论文列表
Improving SERS Sensitivity of TiO2 Through Utilizing the Heterogeneity of the Facets Potentials
来源: | 作者:刘志国 | 发布时间: 2021-02-06 | 77 次浏览 | 分享到:
Xinlu Zheng, Hongli Guo, Yin Xu, Jinlong Zhang and Lingzhi Wang*
Journal of Materials Chemistry C
https://doi.org/10.1039/D0TC03922E

Herein, the heterogeneity of the facets potentials is used to improve the SERS activity of anatase TiO2 single crystals co-exposed with {0 0 1} and {1 0 1} facets. Using methylene blue (MB) as the model molecule, the influence of the exposed-facet-ratio on the SERS activity was explored. The molecules prefer to be adsorbed by defective {0 0 1} facets, but the SERS activity is not proportional to the enlarged {0 0 1} facets. The single crystal exposed with 20% {0 0 1} facets (S00120%) shows the highest SERS activity and a high EF of 8×105 can be achieved. Based on the experimental analysis and density functional theory calculation, the SERS activity is proportionally correlated with the mobility of photo-induced electrons on defective {0 0 1} facets, which is promoted by the surface electric field pointing from exposed {1 0 1} facets to junction edge, and then to {0 0 1} facets as a result of heterogeneous facets potentials.