Electrochemical properties of L-cysteine self-assembled monolayers modified gold electrode of phosphomolytungstenbdic anions

Phosphomolytungstenbdic anions were adsorbed by electrostatic attraction gold electrode on modified L-cysteine self-assembled monolayers. The formation of the film was studied. Experiments showed that acidic medium was benefit to the adsorption of phosphomolytungstenbdic anions. The adsorbing quantity Gamma (0) is 2.57 x 10(-10) mol . cm(-2), which means a single layer on the surface. Cyclic voltammetry, chronocoulmetry, FTIR and SEM were used for the characterization and electrochemical properties of the films. Three stable and reversible redox couples were observed in 1.0 mol . L-1 H2SO4 in the range of 0.8 similar to -0.2 V, which could be attributed to three electrochemical processes of phosphomolytungstenbdic anions. Charge transfer coefficient is 2.64 x 10(-7) cm(2) . s(-1) by chronocoulmetry. Redox properties were also described.