Electrochemical Detection of Dopamine on Electrodeposited Graphene Modified Carbon Molecular Wire Electrode
  
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DOI:10.3969/j.issn.1004-4957.年份.月份
KeyWord:graphene  carbon molecular wire electrode  dopamine  electrochemistry  differential pulse voltammetry
  
AuthorInstitution
杨海旭,卢亚平,施璠,谢海群,孙婆援,孙伟 1.海南师范大学化学与化工学院;2.青岛科技大学化学与分子工程学院
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Abstract:
      By using a kind of molecular wire diphenylacetylene as the modifier and the binder,a new carbon paste electrode,which was denoted as carbon molecular wire electrode(CMWE),was prepared and used as the substrate electrode.Then graphene(GR) was electrodeposited on the surface of CMWE to get the modified electrode named as GR/CMWE.The electrochemical behaviors of dopamine(DA) on GR/CMWE were investigated by cyclic voltammetric method.A pair of the well-defined redox peaks were observed.Compared with that of CMWE,the redox peak currents increased greatly with the decrease of the peak-to-peak difference,indicating that the electrode reaction of DA on GR/CMWE was reversible.Under the optimal conditions,the peak currents had a good linear relationship with DA concentration in the range of 8.0×10-7 – 2.0×10-3 mol/L with a detection limit(3σ) of 2.55×10-7 mol/L.The commonly coexisting substances did not interfere DA detection, and the proposed method was applied in the determination of DA in injection samples with satisfactory results.
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