Raman enhancement (SERS) of the surface phonon modes of TiO2

被引：11

作者：

Islam, Syed K. ^{[1
]}

Lombardi, John R. ^{[2
]}

机构：

[1] Eastern Connecticut State Univ, Dept Phys Sci, Willimantic, CT 06226 USA

[2] CUNY, Grad Ctr, Dept Chem, City Coll New York, New York, NY 10016 USA

来源：

CHEMICAL PHYSICS LETTERS | 2022年 / 806卷

基金：

美国国家科学基金会;

关键词：

2-bipyridine; N-719; SERS; Raman Forbidden Surface modes (SO); TiO2; 2,2'-BIPYRIDINE; SPECTRA; DYE;

D O I：

10.1016/j.cplett.2022.140040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the first observation of the enhancement of Raman forbidden surface phonon modes (SO) of A2u symmetry in TiO2 nanoparticles on the adsorption of 2,2 '-bipyridine and N-719 dye molecules. We identify the observed surface modes in conjunction with HREELS studies and attribute their enhancements to (HerzbergTeller) vibronic coupling between the charge-transfer and the molecular transitions. We conclude that the vibronic coupling is responsible for the enhancements of the surface modes through intensity borrowing. Furthermore, using SERS selection rules, we examine possible orientations of the molecules relative to the surface confirming the Raman forbidden A2u symmetry of the surface modes.

引用

页数：5

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