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Adsorption study of 4‐MBA on TiO 2 nanoparticles by surface‐enhanced Raman spectroscopy
Author(s) -
Yang Libin,
Jiang Xin,
Ruan Weidong,
Zhao Bing,
Xu Weiqing,
Lombardi John R.
Publication year - 2009
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.2358
Subject(s) - adsorption , raman spectroscopy , nanoparticle , molecule , sulfur , spectroscopy , surface enhanced raman spectroscopy , chemistry , saturation (graph theory) , inorganic chemistry , raman scattering , materials science , nanotechnology , organic chemistry , quantum mechanics , physics , mathematics , combinatorics , optics
In this paper, the adsorption of 4‐mercaptobenzoic acid (4‐MBA) on TiO 2 nanoparticles was studied mostly by surface‐enhanced Raman spectroscopy (SERS) and UV‐vis spectroscopy, at different pH values as well as under different temperatures and concentrations. The results show that the 4‐MBA molecules are bonded to the TiO 2 surface both through the sulfur atoms and COO − groups at neutral or alkaline pH, but only through the sulfur atom at acidic pH. Furthermore, the 4‐MBA molecules possess high adsorptive stability on TiO 2 at a comparatively high temperature (150 °C). Concentration‐dependent SERS experiments show that the saturation concentration for 4‐MBA adsorbed on TiO 2 is about 10 −3 M in natural case (pH = 6). Copyright © 2009 John Wiley & Sons, Ltd.