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Citation: ZHANG Xiu-HUA, WANG Sheng-Fu, ZOU Qi-Chao. Preparation and Electrochemical Properties of 2-Mmercaptoethanol Self-assembled Monolayer Modified Gold Electrode[J]. Chinese Journal of Applied Chemistry, ;2002, 19(7): 657-661. shu

Preparation and Electrochemical Properties of 2-Mmercaptoethanol Self-assembled Monolayer Modified Gold Electrode

1.
Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062

Corresponding author: WANG Sheng-Fu,
Received Date: 10 October 2001
Available Online: 10 April 2002
Fund Project: 湖北省自然科学基金资助项目(2000J007) (2000J007)

2-Mercaptoethanol self-assembled monolayer modified gold electrode(ME/Au SAMs) has been fabricated. The electrochemical behavior of metol (N-methyl p-aminophenol sulfate) and p-benzenediol at ME/Au SAMs have been studied. The modified electrode shows an excellent electrocatalytic activity for the oxidation of metol and p-benzenediol, and accelerates electron transfer rate. Diffusion coefficients for metol and p-benzenediol were 2.1×10^-5cm²/s and 2.7×10^-6cm²/s, respectively. The electrocatalysis mechanism has been studied. ATR-FTIR was used for the characterization of the ME/Au SAMs. The oxidation currents were linear in the range of 1.0×10^-7~1.0×10^-4mol/L for metol and 6.0×10^-6~6.0×10^-4mol/L for p-benzenediol, with the correlation coefficients of 0.999 2 and 0.999 6 by differential pulse voltammetry (DPV), and detection limit 2.0×10^-8mol/L and 1.2×10^-6mol/L for metol and p-benzenediol, respectively. The modified electrode can be used for the simultaneous determination of metol and p-benzenediol in photographic imaging agents. The method is simple, quick, sensitive and accurate.
- mercaptoethanol,
- self-assembled monolayer,
- differential pulse voltammetry,
- metol,
- p-benzenediol
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