Selective determination of dopamine on a boron-doped diamond electrode modified with gold nanoparticle/polyelectrolyte-coated polystyrene colloids

Min Wei, Li Guo Sun, Zhuo Ying Xie, Jin Fang Zhii, Akira Fujishima, Yasuaki Einaga, De Gang Fu, Xue Mei Wang, Zhong Ze Gu

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Abstract

Negatively charged gold nanoparticles (AuNPs) and a polyelectrolyte (PE) have been assembled alternately on a polystyrene (PS) colloid by a layer-by-layer (LBL) self-assembly technique to form three-dimensional (Au/PAH)4/(PSS/PAH)4 multilayer-coated PS spheres (Au/PE/PS multilayer spheres). The Au/PE/PS multilayer spheres have been used to modify a boron-doped diamond (BDD) electrode. Cyclic voltammetry is utilized to investigate the properties of the modified electrode in a 1.0M KCl solution that contains 5.0 × 10-3 M K3Fe(CN)6, and the result shows a dramatically decreased redox activity compared with the bare BDD electrode. The electrochemical behaviors of dopamine (DA) and ascorbic acid (AA) on the bare and modified BDD electrode are studied. The cyclic voltammetric studies indicate that the negatively charged, three-dimensional Au/PE/PS multilayer sphere-modified electrodes show high electrocatalytic activity and promote the oxidation of DA, whereas they inhibit the electrochemical reaction of AA, and can effectively be used to determine DA in the presence of AA with good selectivity. The detection limit of DA is 0.8 × 10-6M in a linear range from 5 × 10-6 to 100 × 10-6M in the presence of 1×10-3M AA.

Original languageEnglish
Pages (from-to)1414-1421
Number of pages8
JournalAdvanced Functional Materials
Volume18
Issue number9
DOIs
Publication statusPublished - 2008 May 9

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

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