レーザーラマン分光法を用いる金属表面における導電性有機薄膜の光電解重合の研究

概要

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Vibrational spectroscopic techniques have been applied to characterize the conducting polymer films electrochemically synthesized under various growth conditions. It was found that laser irradiation affected significantly both the microstructure of the films and the kinetics of the polymerization process. To study the laser-induced effects on the formation of polyaniline film, the adsorbed aniline monomer and intermediate reaction products on electrode surfaces were measured in situ by surface-enhanced Raman scattering (SERS). Using a FT-Raman system powered by a Nd : YAG laser, the strong SERS spectra of aniline were obtained on the pre-treated rough silver and gold electrodes. The observed SERS spectra are quite different from that of neat aniline and varied with applied potentials. Characterization of the spectral features confirmed that aniline was polymerized on the electrode surfaces even at much more negative potentials. As the polymerization only occurs at the laser-irradiated site, the conducting polymer patterns could be deposited on the metallic surfaces without any mask fabrication. The effects of electrode potential, surface morphology, and mode of laser irradiation on the SERS spectra, as well as on the kinetics of polymerization are described. A possible mechanism for the photocatalytic process is proposed.
1995-01-05