电化学析氢反应诱导的电荷传递SERS效应(英文)

应用高灵敏度的共焦显微拉曼技术 ,分别研究了水体系和不同pH值的硫脲体系中电化学反应与表面增强拉曼散射 (SERS)效应之间的关系 .研究结果表明 ,在电化学析氢反应电位区 ,电荷转移增强机制起主要作用 ,使表面物种的拉曼强度显著地增强 .

The Charge Transfer Effect of SERS Induced by the Electrochemical Hydrogen Evolution Reaction

As one of the important mechanisms of SERS, the charge transfer (CT) enhancement requires the strong interaction of the adsorbed species with the substrate in o rder to permit the transition of charge between the metal Fermi level (energy st ate) and the molecular orbital［1］. The high enhancement needs the match of the energy gap between the Fermi level (or surface state) and the orbital en ergy lev el of the adsorbed molecules with the energy of the incident light. The electrod e Fermi level is usually adjusted by the applied potential to satisfy the CT res onance. For the electrochemical reaction process, the frontier orbital energy le vel of the reacting surface species should be greatly different from that of the adsorbed molecules. Thus, it is interesting to test the additional SERS enhance ment induced by the electrochemical reaction.