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Citation: JIA Li, LEI Qiu-Fen, ZHANG Xiu-Hua, WANG Sheng-Fu. Determination of Dopamine on o-Aminobenzenethiol Self-Assembled Monolayers Modified Gold Electrode[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 172-175. shu

Determination of Dopamine on o-Aminobenzenethiol Self-Assembled Monolayers Modified Gold Electrode

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

Corresponding author: WANG Sheng-Fu,
Received Date: 26 March 2004
Available Online: 12 August 2004
Fund Project: 湖北省自然科学基金资助项目(2000J007) (2000J007)

o-Aminobenzenethiol(ABT) is covalently combined onto a bare gold electrode to form a self-assembled monolayers modified electrode(ABT/Au SAMs). Attenuated total reflection-Fourier transform infrared spectroscopy was used for the characterization of the films. The modified electrode has an excellent electrocatalytic activity for the oxidation and reduction of dopamine(DP). At ABT/Au SAMs, the oxidation peak potential of dopamine E_pa shifts negatively and the reduction peak potential E_pc shifts positively compared with those at the bare gold electrode. The diffusion coefficient of dopamine on the modified electrode is 3.19×10^-6 cm²/s. The electrocatalytic mechanism is discussed. The reduction peak current increases with the increase in the concentration of dopamine. The reduction peak current exhibits a linear relation in the range of 1.0×10^-6~8.0×10^-4 mol/L. The correlation coefficient is 0.998 2. The detection limit is 2.0×10^-7 mol/L.
- dopamine,
- o-aminobenzenethiol,
- self-assembled monolayer,
- gold electrode,
- square wave voltammetry
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