Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (12): 1102-1106.doi: 10.3866/PKU.WHXB20011209

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Electrochemical Properties of L-cysteine Self-assembled Monolayers Modified

Wang Sheng-Fu;Du Dan;Zou Qi-Chao   

  1. College of Chemistry and Material Science,Hubei University,Wuhan 430062
  • Received:2001-05-14 Revised:2001-09-10 Published:2001-12-15
  • Contact: Wang Sheng-Fu

Abstract: 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 Γ0 is 2.57×10-10 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~-0.2 V,which could be attributed to three electrochemical processes of phosphomolytungstenbdic anions.Charge transfer coefficient is 2.64×10-7 cm2•s-1 by chronocoulmetry.Redox properties were also described.

Key words: Electrostatic adsorption, Self-assembled film, Chemically modified electrode, hosphomolytungstenbdic anions, L-cysteine