Electropolymerization of some amino acids on platinum electrode

Abstract

This paper studied the anodic oxidation of L-amino acids on smooth platinum and modified Pt electrodes (Pt/AAO). The oxidation of L-amino was carried out by cyclic voltammetry coupled with electrochemical quartz crystal microbalance (EQCM). The Amino acid concentration, pH of the electrolyte and the scan number effects on cyclic voltammetry were examined. Spectroscopic analysis, such as attenuated total reflectance FT infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS), characterize the resulting thin film coatings. Scanning electron microscopy (SEM) is used to study the morphology of thin film surfaces and their solubility. Spectroscopic measurements favor L-amino acids electropolymerization into poly-L-amino acids in an irreversible way. The electrosynthesis of poly-L-amino acids was used as a proton receptor for the solid-state pH solid sensor. Keywords. Anodic oxidation, L-amino acids, electropolymerization, pH sensor.