Charge-Transfer and SERS Coupling on TiO₂  

作　　者：Syed K. Islam Antonio Ponte Syed K. Islam;Antonio Ponte(Department of Physical Sciences, Eastern Connecticut State University, Willimantic, CT, USA)

机构地区：[1]Department of Physical Sciences, Eastern Connecticut State University, Willimantic, CT, USA

出　　处：《American Journal of Analytical Chemistry》2023年第11期519-530,共12页美国分析化学（英文）

摘　　要：We report the SERS enhancements of Raman forbidden surface modes of TiO₂ in different sized TiO₂ 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 TiO₂ 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 TiO₂ crystals most likely also dictates the enhancements of the N-719 dyes.We report the SERS enhancements of Raman forbidden surface modes of TiO₂ in different sized TiO₂ 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 TiO₂ 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 TiO₂ crystals most likely also dictates the enhancements of the N-719 dyes.

关 键 词：CHARGE-TRANSFER Vibronic Coupling Fano Profile TiO₂ Sur-face Modes 

分 类 号：O65[理学—分析化学]