In:
Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 641-642 ( 2013-1), p. 841-844
Kurzfassung:
Glassy carbon electrode (GCE) was modified using graphene (G), quercetin (Qu) and Nafion in this sequence to fabricate Nafion-Qu-G composite-modified GCE (Nafion/Qu/G/GCE). The as-prepared modified electrode combining the advantages of Nafion, Qu and G was employed for the selective and sensitive detection of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA). Compared with GCE, Qu/GCE, G/GCE and Qu/G/GCE, the Nafion/Qu/G/GCE was more electroactive and selective for DA. Differential pulse voltammetry (DPV) was used for electrochemical detection, the separations of the oxidation peak potentials for AA-DA and DA-UA were about 304 mV and 136 mV, which allowed selectively determining DA. In phosphate buffer solution (PBS) of pH 6.8, the Nafion/Qu/G/GCE provided a detection limit of 2.31×10 -8 mol/L (S/N=3) for DA. Linearity (R=0.9963) of the peak currents against the concentration of DA was found over the range of 1.0×10 -7 to 1.0×10 -3 mol/L. Furthermore, the modified electrode exhibited good reproducibility and stability.
Materialart:
Online-Ressource
ISSN:
1662-8985
DOI:
10.4028/www.scientific.net/AMR.641-642
DOI:
10.4028/www.scientific.net/AMR.641-642.841
Sprache:
Unbekannt
Verlag:
Trans Tech Publications, Ltd.
Publikationsdatum:
2013
ZDB Id:
2265002-7
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