Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 39, Pages 13836-13842Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc03922e
Keywords
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Funding
- National Natural Science Foundation of China [21673073, 21677048, 5171101651]
- Science and Technology Commission of Shanghai Municipality [16JC1401400, 17520711500]
- Fundamental Research Funds for the Central Universities [222201717003]
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Herein, the heterogeneity of the facet-potentials was used to improve the SERS activity of anatase TiO(2)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 (S(001)20%) showed the highest SERS activity, and a high EF of 8 x 10(5)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.
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