原子与分子物理学报2008，Vol.25Issue(5)：1221-1228,8.
p-Thiocresol吸附在银纳米粒子表面系统的表面增强拉曼散射和表面增强共振拉曼散射的增强研究
Enhancement for surface enhanced raman scattering and surface enhanced resonance raman scattering of P-thiocresol adsorbed on silver nanoparticle
摘要
Abstract
The surface-enhanced Raman scattering(SERS)of P-Thioeresol adsorbed on colloidal silver at the incident light of 514.5 nm is reported experimentally and theoretically.The enhancement mechanisms of them are analyzed.The enhancement is mostly contributed from the electromagnetic enhancement.If the coupling effect of two Ag nanoparticles(diameter of 100 nm)with a distance of 2 nm is considered,in the center between two particles,electromagnetic enhancement of SERS is 7.16×107.The static chemical enhancement also plays a role and the enhancement is 6.So,the total enhancement of SERS,including the static chemical enhancement and the electromagnetic enhancement,is Gtotal=Gsc × GEm=4.4 × 108.The surface-enhanced resonance Raman scattering(SERRS)of the system is also studied theoretically.When the incident light resonates with the excited state of P-Thioeresol-ag3 complex,the charge transfer mechanism(chemical enhancement)also plays an important role and the strongest charge transfer enhancement can reach up to 106.We visualize the orientation and result of charge transfer between P-Thiocresol and ig cluster on the excitation with charge difference density,which is the directly theoretical evidence for charge transfer.The enhancement of SERRS,including the charge transfer and electromagnetic mechanisms,can reach up to 1013.关键词
SERS/化学增强/电磁场增强/电荷转移Key words
SERS/chemical enhancement/electromagnetic enhancement/charge transfer分类
数理科学引用本文复制引用
万松博,沈岩,段建民,陈茂笃,贾瑜..p-Thiocresol吸附在银纳米粒子表面系统的表面增强拉曼散射和表面增强共振拉曼散射的增强研究[J].原子与分子物理学报,2008,25(5):1221-1228,8.基金项目
中国国家自然科学基金(10604012,10574113) （10604012,10574113）
SRF for ROCS,SEM(2006) （2006）
