Exploration of synergism between a polymer matrix and gold nanoparticles for selective determination of dopamine
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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Title |
Exploration of synergism between a polymer matrix and gold
nanoparticles for selective determination of dopamine
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Creator |
Senthil Kumar, S.
Mathiyarasu, J. Phani, K.L.N. |
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Subject |
Electrodics and Electrocatalysis
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Description |
In this work, synergism between the conducting polymer matrix and gold nanoparticles is explored for dopamine sensing in the
presence of excess ascorbic acid using poly (3,4-ethylenedioxythiophene) (PEDOT) in neutral phosphate buffer solutions (PBS 7.4).
The electrodeposited thin films of PEDOT were characterized by atomic force microscopy (AFM) (and current sensing-AFM), and
the incorporated Au nanoparticles by UV–Vis spectroscopy and electrochemical methods. Distinct ‘‘oxidized’’ and ‘‘reduced’’
regions of the polymer film were revealed in the CS-AFM. Electrochemical studies have shown that the catalytic oxidation of
DA and AA on PEDOT modified electrodes can afford a peak potential separation of �230 mV. Further enhancement in the oxidation
current for DA/AA oxidation was achieved by incorporation of Au nanoparticles in the PEDOT modified electrodes. The
nanometer sized gold particles favour the nanomolar sensing of dopamine in the presence of excess of ascorbic acid (1.0 mM). The
DA oxidation current increases linearly with DA concentration and the detection limit of DA is found to be �2 nM. Amperometric
detection under stirred conditions is free from electrode fouling at lower concentrations of DA and is only slightly affected at concentrations
beyond 20 lM. The combined effect of Au nanoparticles and the PEDOT matrix is based on the Aunano surrounded by a
‘‘hydrophobic sheath’’ tending to reside within these hydrophobic regions of PEDOT, increasing the DA oxidation current.
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Publisher |
Elsevier
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Date |
2005
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cecri.csircentral.net/97/1/047-2005.pdf
Senthil Kumar, S. and Mathiyarasu, J. and Phani, K.L.N. (2005) Exploration of synergism between a polymer matrix and gold nanoparticles for selective determination of dopamine. Journal of Electroanalytical Chemistry, 578 (1). pp. 95-103. |
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Relation |
http://cecri.csircentral.net/97/
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