Photosensitive Oligomer Formation and Laser-induced Polymerization of Aniline on a Gold Electrode Surface: A Surface-Enhanced Raman Scattering Study

Abstract

The process of laser-induced electropolymerization of aniline was studied by in situ surface-enhanced Raman scattering (SERS) spectroscopy and cyclic voltammetry (CV). Formation of p-coupled aniline oligomers was confirmed at an electrode potential below the oxidation potential of aniline, and the oligomers were found to be the source compound for photo-induced electropolymerization.

Effect of Aromatic Amine−Metal Interaction on Surface Vibrational Raman Spectroscopy of Adsorbed Molecules Investigated by Density Functional Theory

“…For aniline adsorbed on silver and gold, the strongest SERS band was observed at ∼1000 cm −1 , which can be attributed to the v 12 vibration . Although some preternatural bumps appeared at around ∼950 and 1080 cm −1 in the SERS of aniline on silver and gold, respectively, the abnormally enhanced SERS bands were overlooked. Now we assign it to the wagging vibration of the NH 2 group on the basis of our present theoretical calculations.…”

Electrochemical polymerization of acetylene on Rh electrodes probed by surface-enhanced Raman spectroscopy

“…It has been demonstrated that a selective electrochemical manufacture can be realized with the aid of laser and the laser-induced electrochemical polymerization of organic compounds has also been reported [29,[37][38][39]. Therefore, we carried out an experiment to find out whether the laser has an effect on the polymerization of acetylene.…”

Preparation of SERS‐active gold film electrodes via electrocrystallization: their characterization and application with NIR excitation

“…In the SERS spectrum recorded with the gold substrate, many strong bands are found. Because of this difference from the silver spectrum and because Ishioka et al 30 reported a different spectrum, although under different experimental conditions, one can question whether these strong bands are related to reaction products. However, the possibility of oligomer formation followed by photoinduced polymerization can most likely be excluded because of the long wavelength excitation.…”

“…However, the possibility of oligomer formation followed by photoinduced polymerization can most likely be excluded because of the long wavelength excitation. 30 Alternatively, one can speculate that the strong bands are related to normal modes that involve movement of the atoms of the amino groups and experience the strong enhancement because of the close proximity to the metal surface.…”