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pH Dependence of the Surface‐Enhanced Raman Scattering of p ‐Nitroaniline Adsorbed on Silver Sols
Author(s) -
MunizMiranda Maurizio
Publication year - 1997
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/(sici)1097-4555(199704)28:4<205::aid-jrs78>3.0.co;2-n
Subject(s) - raman scattering , adsorption , chemistry , raman spectroscopy , molecule , colloid , nitro , substrate (aquarium) , metal , inorganic chemistry , ion , nitroaniline , spectral line , silver nanoparticle , analytical chemistry (journal) , nanoparticle , materials science , organic chemistry , nanotechnology , optics , geology , physics , alkyl , oceanography , astronomy
The surface‐enhanced Raman (SER) scattering of p ‐nitroaniline adsorbed on silver colloids was investigated and compared with previous results obtained on a silver electrode. The SER spectra change significantly on varying the pH of the colloidal dispersions and correspond to different adsorbed species identified by comparison with the normal Raman spectra. In acidic medium the neutral molecule is adsorbed on the metal substrate via the nitro group, whereas at alkaline pH p ‐nitroaniline adsorbs as an anion in a quinonoidic electronic state. © 1997 by John Wiley & Sons, Ltd.