Thiourea adsorption on a Pt surface as detected by electrochemical methods and surface-enhanced Raman spectroscopy
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The adsorption behavior of thiourea (TU) on a roughened Pt electrode was investigated by combining electrochemical methods and surface-enhanced Raman spectroscopy. It was found that TU could be dissociated on a roughened Pt surface at the open circuit potential to form a surface sulfide. The dissociation process can be effectively suppressed if the electrode is immersed into the solution with its potential controlled at a negative value. Using these tactics, we are able to perform a surface-enhanced Raman spectroscopy (SERS) study of the adsorption behavior of TU on Pt. The SERS results reveal that TU is adsorbed through its sulfur atom in a tilted way and the orientation changes with the applied potential. The study points out the importance of controlling the electrode potential properly upon immersion of the electrode into the solution. (C) 2004 Elsevier B.V. All rights reserved.