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Copper-modified poly(3,4-ethylenedioxythiophene) layers for selective determination of dopamine in the presence of ascorbic acid: I. Role of the polymer layer thickness

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Abstract

The oxidation of ascorbic acid (AA) and dopamine (DA) is studied on non-modified and copper crystal-modified poly(3,4-ethylenedioxythiophene) (PEDOT)-coated electrodes. Both oxidation reactions are studied for different thickness of the polymer layers. For several microns thick PEDOT layers both PEDOT and Cu-modified PEDOT show the largest currents. A stable voltammetric response for AA oxidation is observed together with a linear dependence of the peak currents on concentration in the 0.3 to 6.0 mM range. For DA oxidation, however, a gradual loss of electroactivity is found with increasing number of voltammetric scans and concentration. This problem is overcome by using thinner (<1 µm) polymer layers. In the presence of both AA and DA, the Cu-modified PEDOT-coated electrodes provide better selectivity with respect to DA in comparison to non-modified PEDOT due to partial suppression of the AA oxidation currents. Thin PEDOT layers modified with electrodeposited Cu crystals show a stable and sensitive response for DA oxidation in the micromolar concentration range. A linear dependence of the voltammetric peak currents is found in a wide concentration range (from 6 to about 200 µM) of DA in the presence of a large excess (1 mM concentration) of AA. The sensitivity is 0.013 µA µM-1.

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Acknowledgments

Donation of EDOT by H.C. Strack GmbH, Germany is gratefully acknowledged. The investigations are completed with the financial support of Bulgarian Ministry for Education and Science obtained under contracts X-1405 and VUH 307/2007.

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  1. Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

    Aneliya Stoyanova & Vessela Tsakova

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  1. Aneliya Stoyanova
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  2. Vessela Tsakova
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Correspondence to Vessela Tsakova.

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Stoyanova, A., Tsakova, V. Copper-modified poly(3,4-ethylenedioxythiophene) layers for selective determination of dopamine in the presence of ascorbic acid: I. Role of the polymer layer thickness. J Solid State Electrochem 14, 1947–1955 (2010). https://doi.org/10.1007/s10008-010-1007-y

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  • DOI: https://doi.org/10.1007/s10008-010-1007-y

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