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Improving SERS sensitivity of TiO2 by utilizing the heterogeneity of facet-potentials
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2020-09-12 , DOI: 10.1039/d0tc03922e
Xinlu Zheng 1, 2, 3, 4, 5 , Hongli Guo 1, 2, 3, 4, 5 , Yin Xu 1, 2, 3, 4, 5 , Jinlong Zhang 1, 2, 3, 4, 5 , Lingzhi Wang 1, 2, 3, 4, 5
Affiliation  

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.

中文翻译:

利用面势的异质性提高TiO2的SERS敏感性

在此,利用面电位的异质性来提高与{0 0 1}和{1 0 1}面共暴露的锐钛矿型TiO 2单晶的SERS活性。以亚甲基蓝(MB)为模型分子,研究了刻面比对SERS活性的影响。分子更喜欢被有缺陷的{0 0 1}刻面吸附,但SERS活性与扩大的{0 0 1}刻面不成比例。暴露了20%{0 0 1}切面(S 001 20%)的单晶显示出最高的SERS活性,并且EF高达8×10 5可以实现。根据实验分析和密度泛函理论计算,SERS活性与缺陷{0 0 1}面上的光诱导电子的迁移率成比例相关,这是由暴露的{1 0 1}指向表面的电场所促进的。到交界边,然后到{0 0 1}方面,由于异构方面的潜力。
更新日期:2020-10-16
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