Molecular Self-assembled Monolayer Of Surface-enhanced Raman Spectroelectrochemical Studies

Surface Enhanced Raman Scattering( SERS) is sensitive for in situ studying of orientation of molecules adsorbed on the substrate and probing of interfacial phenomena. SERS technology, using silver, gold, or other noble metals as substrates, has been a powerful and sensitive instrumental tool for obtaining detailed in formation of adsorbed molecules, such as the adsorption configuration of molecules and the interaction mechanism of the molecules with the surface of the substrate. An electrode modified with a SAM can be the basis of the molecular design of interfaces to control the configuration and structure on the electrode surface or get more functions. Many of these applications are made on metals most practical to various branches of surface chemistry. So it is necessary to study the formation and structure of the films of molecular formed on the metal surface, the nature of the bonding between metal and films, and the mechanism accompanying the formation of the adsorbed species.In order to achieve above objectives, this thesis work deals with the following research work: We prepared the uniform films of cysteamine and basic unit s of nucleic acid on gold or silver metal electrodes surface with proper methods. Characterization of the SAMs was performed by in-situ surface-enhanced Raman spectroscopy (SERS) and Electrochemistry. The contribution of this work is of importance in understanding the interfacial properties of SAMs on metal surfaces. The structure and properties of the interfacial region is different from the film bulk. The SERS spectra of the adsorptive groups on the surfaces were employed as the direct evidence to deduce the adsorptive orientation of SAMS. We evaluated the category and properties of the adsorptive films and analyzed the mechanism of the SERS of SAMs on electrodes surface in detail, the theoretic model was also proposed in this thesis.