Issue 39, 2020

Improving SERS sensitivity of TiO2 by utilizing the heterogeneity of facet-potentials

Abstract

Herein, the heterogeneity of the facet-potentials was 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 preferred to be adsorbed by defective {0 0 1} facets, but the SERS activity was not proportional to the enlarged {0 0 1} facets. The single crystal exposed with 20% {0 0 1} facets (S00120%) showed the highest SERS activity, and a high EF of 8 × 105 could be achieved. Based on the experimental analysis and density functional theory calculation, the SERS activity was proportionally correlated with the mobility of photo-induced electrons on defective {0 0 1} facets, which was promoted by the surface electric field pointing from exposed {1 0 1} facets to the junction edge, and then to {0 0 1} facets as a result of heterogeneous facet-potentials.

Graphical abstract: Improving SERS sensitivity of TiO2 by utilizing the heterogeneity of facet-potentials

Supplementary files

Article information

Article type
Paper
Submitted
18 Aug 2020
Accepted
10 Sep 2020
First published
12 Sep 2020

J. Mater. Chem. C, 2020,8, 13836-13842

Improving SERS sensitivity of TiO2 by utilizing the heterogeneity of facet-potentials

X. Zheng, H. Guo, Y. Xu, J. Zhang and L. Wang, J. Mater. Chem. C, 2020, 8, 13836 DOI: 10.1039/D0TC03922E

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