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Start Over Author "Zhan, Wenyi" Publisher elsevier bv
13 results on '"Zhan, Wenyi"'

11. Application of a mercapto-terminated binuclear Cu(II) complex modified Au electrode to improve the sensitivity and selectivity for dopamine detection

Author

Shu Tian, Zhan Wenyi, Guoqing Jiang, Guomin Jiang, Gu Xuefang, and Tingting Chen

Subjects
Detection limit, Chemistry, Inorganic chemistry, Metals and Alloys, Condensed Matter Physics, Electrochemistry, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Dielectric spectroscopy, Monolayer, Electrode, Materials Chemistry, Differential pulse voltammetry, Electrical and Electronic Engineering, Cyclic voltammetry, Selectivity, Instrumentation
Abstract

A new mercapto-terminated binuclear Cu(II) complex, [Cu2Cl2(mtboc)2(C12H8N2)2] [mtboc =2-(methylthio)benzo[d]oxazole-5-carboxylic acid] (Cu2), was synthesized and characterized by single-crystal X-ray diffraction studies. The Cu2 complex was then immobilized on the surface of Au electrodes through S Au bonds to form a self-assembled monolayer. The electrochemical properties of the as-prepared Cu2- modified Au electrode (Au/Cu2) were investigated using cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry (DPV). Moreover, as a biomimetic sensor for the determination of dopamine (DA) and uric acid (UA), the Au/Cu2 electrode exhibited excellent electrocatalytic activity for the oxidation of DA with a faster electron-transfer rate (6.61 s−1). The DPV technique was used for the trace determination of DA. The dependence of current vs. concentration was linear from 0.2 to 30 μM with a regression coefficient of 0.9975, and the detection limit of DA was ∼ 0.08 μM. Furthermore, the modified electrode clearly separated the DA signal from the interference effect of UA, thus realizing the simultaneous detection of DA and UA. Finally, the method was applied to the selective and precise analysis of DA in commercial injection and urine samples.

Published
2015

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