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Selective Determination of Dopamine on a Boron‐Doped Diamond Electrode Modified with Gold Nanoparticle/Polyelectrolyte‐coated Polystyrene Colloids
Author(s) -
Wei Min,
Sun LiGuo,
Xie ZhuoYing,
Zhii JinFang,
Fujishima Akira,
Einaga Yasuaki,
Fu DeGang,
Wang XueMei,
Gu ZhongZe
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701099
Subject(s) - materials science , electrode , ascorbic acid , polystyrene , electrochemistry , polyelectrolyte , cyclic voltammetry , nanoparticle , colloidal gold , chemical engineering , redox , inorganic chemistry , nanotechnology , composite material , chemistry , polymer , food science , engineering , metallurgy
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 1.0 M KCl solution that contains 5.0 × 10 −3 M K 3 Fe(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 −6 M in a linear range from 5 × 10 −6 to 100 × 10 −6 M in the presence of 1 × 10 −3 M AA.