[Adsorption studies of gamma-aminopropyltrimethoxysilane on iron surfaces by surface-enhanced Raman spectroscopy]

The films of gamma-aminopropyltrimethoxysilane (gamma-APS) on iron electrode surfaces were studied. The silane films were characterized by in-situ Surface-Enhanced Raman Spectroscopy (SERS). It has been found that the potential-dependent Surface-enhanced Raman Spectroscopy are useful for diagnosing the formation and structure of gamma-APS moieties bound onto the surface of metal substrates. Results of SERS indicated that the silanol and amino groups were adsorbed competitively on the metal surfaces. At the same time, the electrode potential, and illumination of laser all have great influence on the nature of these head groups. It was also found that the different states of amine transformed with the change in the potential.