The potential-induced adsorption structure of 1,3,5-benzenetricarboxylic acid (trimesic acid TMA) on Au, Ag, and Cu electrode surfaces has been examined by means of surface-enhanced Raman scattering (SERS) in an applied voltage range between -0.6 and 0.6 V. Spectral analyses indicate that TMA is assumed to have a perpendicular geometry with its benzene ring on Au, Ag, and Cu surfaces. The carboxylate band's strong appearance at ∼1390 cm-1 indicates that TMA should bind to the metal surfaces via its carboxylate group. As the electric potential is shifted from 0.6 to -0.6 V, the adsorption of TMA onto the electrodes' surfaces appears to change, as indicated by the frequency shift or the change in the vibrational bands' intensity. As previously reported [B. Han, Z. Li, S. Pronkin, Th. Wandlowski, Can. J. Phys. 82 (2004) 1481], depending on the applied electric field, it seems possible that TMA may form several distinctly different adlayer structures on an Au surface between 0 and 0.4 V. Such a potential-dependent adsorption change depending on the applied electric field is not found to occur on Ag and Cu under our potential region.
Bibliographical noteFunding Information:
S.W.J. thank Prof. Kwan Kim and Prof. Seong Keun Kim for helpful guidance and Dr. Jong Kuk Lim for helping experiments. This work was supported by the Korea Science and Engineering Foundation (KOSEF R01-2006-000-10017-0), Korea Research Foundation Grant (R-14-2002-004-01000), and the Seoul R&BD Program. This work was supported by the Soongsil University Research Fund. K.L. thank the financial support by the KOSEF through Basic Research Fund (R01-2004-000-10944-0) and National Core Research Center for Nanomedical Technology (R15-2004-024-00000-0).
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Organic Chemistry
- Inorganic Chemistry