Optimization of dopamine determination based on nanowires PEDOT/polydopamine hybrid film modified electrode
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Poly(3,4-ethylenedioxythiophene) nanowires (nw-PEDOT), between 6.7–13.8 nm diameter, were obtained by electrochemical methods utilizing modified electrodes with silicon oxide as a template to afford a Pt/nw-PEDOT electrode. Dopamine electro-polymerization was next accomplished upon this electrode (Pt/nw-PEDOT/PDA). The Pt/nw-PEDOT/PDA assembly is capable of hindering interfering signals such as those from ascorbic and uric acid, enabling thus the selective detection of dopamine. Amperometric determination studies allowed limit of detection and limit of quantification limits of 0.47 and 1.59 µM, respectively, to be established. These limits were lower than those obtained with the same conducting polymer but without a nanowire structure.
KeywordsDopamine Poly(3, 4-ethylenedioxythiophene) Nanowires Hybrid film Mesoporous silica template
The authors kindly acknowledge the financial support through Project FONDECYT Nr. 1110041 and 1141158. R. Salgado thanks CONICYT Scholarship 2010, Folio 63,100,053.
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