Solvent Effect on the Electrochemical Behavior of Self-assembled Monolayers

Abstract

Abstract: The electrodes modified with 4-hydroxy-2-mercapto-6-methylpyrimidine(HMMP) monolayers were prepared in solvents acetone, dimethyl sulfoxide(DMSO), ethanol, dimethyl formamide(DMF) and water respectively, and their electrochemical behavior for ascordic acid and dopamine were studied by cyclic voltammetry, impedance spectroscopy and STM. The results confirmed that the solvent molecules could be trapped in the monolayers during the process of self-assembly, and the monolayers prepared with different solvents showed a different electrochemical behavior in electrocatalytic oxidation to ascordic acid and dopamine. By the impedance analysis, exchange current density and coverage of HMMP(Acetone)/Au electrode and HMMP(DMSO)/Au electrode were 1.14, 2.04 μA/cm² and 96.2%, 93.2%, respectively. STMimages showed that the monolayers prepared with acetone and DMSOas solvent possessed different degrees of order and compactness.

Key words: Solvent effect, Selfassembledmonolayers, Electrochemical behaviour, Ascordic acid, Dopamine

CLC Number:

O657.1

TrendMD:

SUN Qiao-Yu, ZHANG Xiao-Gang, LI Xiao-Hong, LI Hu-Lin . Solvent Effect on the Electrochemical Behavior of Self-assembled Monolayers[J]. Chem. J. Chinese Universities, 2001, 22(10): 1693.

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Solvent Effect on the Electrochemical Behavior of Self-assembled Monolayers

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