Combining surface and plasmon resonance spectroscopy and electrochemical techniques for gold surface modification aiming to new sensors development studies

• Grant number: 07/01212-0
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: June 01, 2007
• End date: September 25, 2008
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Lucio Angnes
• Grantee: Rodrigo Alejandro Abarza Muñoz
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The combination of surface plasmon resonance (SPR) with electrochemical techniques is proposed to study the modification of gold surfaces in order to develop new sensors. The association of these techniques has been shown the possibility the monitoring on real-time of changes occurring at the electrode/solution interface provoked by the application of different potentials on these surfaces. SPR records changes which occur at the metal/dielectric interface caused by several effects, as adsorption of substances on metallic surfaces, formation of electropolimerized films or the presence of solid particles in the region. Therefore, modulating the metallic film characteristics (chemical reaction), changes on the refraction index occurs, which affect the SPR phenomenon. In this way, the electrochemical formation of polymeric monolayers on the gold surface can be monitored by SPR. (AU)