2000
DOI: 10.1021/la991704t
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Ellipsometric and Electrochemical Study of Dopamine Adsorbed on Gold Electrodes

Abstract: The adsorption of dopamine (DA) on gold electrodes in aqueous sulfuric solutions of pH = 1 has been analyzed with the aid of in situ voltammetric and ellipsometric techniques. The initial stage of the process is the formation of an approximately 50-nm thick incipient hydrous gold oxide interface on the metal. Dopamine diffused into the incipient-oxide adlayer is weakly adsorbed. Significant variations of the pseudocapacity in the 0.6 < E < 0.9 V potential region were detected as a function of the adsorption ti… Show more

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Cited by 16 publications
(13 citation statements)
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“…The optical indices of the substrate were obtained at open circuit in the aqueous electrolyte, from the ellipsometric parameters of the polished gold electrode. The resulting values were in good agreement with previously reported data [15,28,29].…”
Section: Methodssupporting
confidence: 92%
See 3 more Smart Citations
“…The optical indices of the substrate were obtained at open circuit in the aqueous electrolyte, from the ellipsometric parameters of the polished gold electrode. The resulting values were in good agreement with previously reported data [15,28,29].…”
Section: Methodssupporting
confidence: 92%
“…Experimental conditions were similar to those described in previous work [28,29]. The gold electrode was made by axially fitting a polycrystalline gold plaque (99.99% purity, 1.5 mm thick) into a Teflon sheath.…”
Section: Methodsmentioning
confidence: 99%
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“…1,2 However, the electrochemical detection of DA at the conventional electrodes has suffered from a high concentration of AA present in mammalian nerve and brain tissues because of close oxidation potentials and the reaction between AA and the oxidized form of DA. 3 In order to improve the selectivity and sensitivity, various modified electrodes, [4][5][6][7][8][9][10][11] especially based on self-assembly technology, 12 have been developed for determining DA.…”
Section: Introductionmentioning
confidence: 99%