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Experimental and theoretical evidence for the chemical mechanism in SERRS of rhodamine 6G adsorbed on colloidal silver excited at 1064 nm
Author(s) -
Dong Bin,
Liu Liwei,
Xu Hongxing,
Sun Mengtao
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2605
Subject(s) - rhodamine 6g , excited state , raman scattering , silver nanoparticle , chemistry , raman spectroscopy , photochemistry , adsorption , absorption (acoustics) , colloid , rhodamine , molecule , nanoparticle , absorption spectroscopy , resonance (particle physics) , chemical physics , analytical chemistry (journal) , materials science , nanotechnology , fluorescence , atomic physics , organic chemistry , optics , physics , composite material
The evidence for the existence of a chemical mechanism in surface‐enhanced resonance Raman scattering (SERRS) of rhodamine 6G (R6G) adsorbed on colloidal silver excited at 1064 nm is reported on the basis of experimental and theoretical analyses. A weak absorption peak at around 1060 nm for R6G‐functionalized silver nanoparticles was observed, which is not present in the individual spectra of R6G or silver nanoparticles. Theoretically, the charge difference density reveals that this weak absorption is a metal‐to‐molecule charge transfer excited state. Copyright © 2010 John Wiley & Sons, Ltd.