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Polyaniline–multi-wall-carbon nanotube nanocomposites as a dopamine sensor

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Author(s): REZA EMAMALI SABZI | KAMRAN REZAPOUR | NASER SAMADI

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 75;
Issue: 4;
Start page: 537;
Date: 2010;
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Keywords: multi-wall-carbon nanotubes | dopamine | nanocomposite | polyaniline | sensor

ABSTRACT
A composite of polyaniline with multi-wall-carbon nanotubes (PANi/ /MWCNTs) was synthesized by an in situ chemical oxidative polymerization method. The PANi nanoparticles were synthesized chemically using aniline as the monomer and ammonium peroxydisulfate as the oxidant. The nanocomposites were prepared as a carbon paste using functionalized MWCNTs and PANi nanoparticles. The PANi–MWCNTs were characterized physically using scanning electron microscopy (SEM) and the electrochemical behavior of the composites in acidic solution (HCl) was investigated using cyclic voltammetry. The PANi/MWCNT composite electrode was used for studying dopamine (DA) as an electroactive material. The cyclic voltammetric results indicated that multi-wall carbon nanotubes (MWCNTs) significantly enhanced the electrocatalytic activity in favor of the oxidation of DA. The kinetics of the catalytic reaction was investigated using the chronoamperometry technique whereby the average va¬lue of the diffusion coefficient (D) and the catalytic rate constant (k) for DA were determined to be (7.98±0.8)×10-7 cm2 s-1 and (8.33±0.072)×104 dm3 mol-1 s-1, respectively.
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