Surface-enhanced Raman scattering of coumarin 343 on silver colloidal nanoparticles

被引：17
作者：
Hussain, Shafqat [1 ]
Pang, Yoonsoo [2 ]
机构：
[1] Gwangju Inst Sci & Technol, Dept Phys & Photon Sci, 123 Cheomdangwagi Ro, Gwangju 61005, South Korea
[2] Gwangju Inst Sci & Technol, Dept Chem, 123 Cheomdangwagi Ro, Gwangju 61005, South Korea
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2016年 / 166卷
基金：
新加坡国家研究基金会;
关键词：
Surface-enhanced Raman scattering; Coumarin; 343; Ag colloidal nanoparticles; Surface adsorption geometry; AG-N N=2-8; CHEMICAL MECHANISM; SELECTION-RULES; CHARGE-TRANSFER; BENZOIC-ACID; SOLAR-CELLS; ADSORPTION; GOLD; SPECTROSCOPY; SPECTRA;
D O I：
10.1016/j.saa.2016.05.011
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
Surface-enhanced Raman scattering (SERS) of coumarin 343 (C343) adsorbed on silver colloidal nanoparticles reduced by sodium citrate was investigated and the surface adsorption geometry of C343 on Ag was sought by optimizing C343-Ag complexes for neutral and deprotonated C343 molecules in the DFT simulations. The SERS of C343 showed a number of spectral changes upon solution pH change. We found that deprotonated C343 adsorbs on the Ag nanoparticles through the carboxylate group keeping a perpendicular geometry to the surface. When protonated, the adsorption geometry of C343 is changed into more or less flat to the surface as the cyclic ester group becomes a preferred surface adsorption site. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：121 / 128
页数：8
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