Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 40, Issue 12, Pages 2004-2008Publisher
WILEY
DOI: 10.1002/jrs.2358
Keywords
SERS; charge transfer; adsorption; TiO2; 4-MBA
Categories
Funding
- National Natural Science Foundation of People's Republic of China, [20573041, 20773044, 20873050]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0422]
- Program for New Century Excellent Talents in University (NCET)
- 111 project [1306009]
- Development Program of the Science and Technology of Jilin Province [20060902-02, 20075020]
- Key Projects in the National Science & Technology Pillar Program [20071BA138B03]
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In this paper, the adsorption of 4-mercaptobenzoic acid (4-MBA) on TiO2 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 TiO2 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 TiO2 at a comparatively high temperature (150 degrees C). Concentration-dependent SERS experiments show that the saturation concentration for 4-MBA adsorbed on TiO2 is about 10(-3) M in natural case (pH = 6). Copyright (C) 2009 John Wiley & Sons, Ltd.
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