%0 Journal Article
%T Charge-Transfer and SERS Coupling on TiO<sub>2</sub>
%A Syed K. Islam
%A Antonio Ponte
%J American Journal of Analytical Chemistry
%P 519-530
%@ 2156-8278
%D 2023
%I Scientific Research Publishing
%R 10.4236/ajac.2023.1411030
%X We report the SERS enhancements of Raman forbidden surface modes of TiO<sub>2</sub> in different sized TiO<sub>2</sub> crystals. This current study utilizes the relationship between the vibronic coupling and the degree of charge-transfer to explain the differences of Surface Enhanced Raman Scattering (SERS) enhancements. Our study shows a direct correlation between the degree of charge-transfer and vibronic coupling. This relationship suggests that charge-transfer between the N-719 dye and TiO<sub>2</sub> due to vibronic coupling plays a fundamental role in SERS enhancements. Furthermore, this study shows a strong dependence of the enhancements of the N-719 dye molecular modes to that of the surface modes. This indicates that the mechanism that governs the enhancements of the surface modes in TiO<sub>2</sub> crystals most likely also dictates the enhancements of the N-719 dyes.
%K Charge-Transfer
%K Vibronic Coupling
%K Fano Profile
%K TiO&lt
%K sub&gt
%K 2&lt
%K /sub&gt
%K Sur-face Modes
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=129470