A selective sensor based on Au nanoparticles-graphene oxide-poly(2,6-pyridinedicarboxylic acid) composite for simultaneous electrochemical determination of ascorbic acid, dopamine, and uric acid

作者：Tig Gozde Aydogdu; Gunendi Gulendem; Pekyardimci Sule

来源：Journal of Applied Electrochemistry, 2017, 47(5): 607-618.

DOI：10.1007/s10800-017-1060-7

• Poly(2,6-pyridinedicarboxylic acid)
• Graphene oxide
• Simultaneous determination
• Ascorbic acid
• Dopamine
• Uric acid

A new strategy based on gold nanoparticles (AuNPs), poly(2,6-pyridinedicarboxylic acid) (P(PDA)), and a graphene oxide (GO)-modified glassy carbon electrode (GCE/AuNPs/P(PDA)-GO) for the simultaneous electrochemical determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA) was proposed in this study. The composite electrode was characterized using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). The GCE/AuNPs/P(PDA)/GO exhibited good electrochemical behavior towards the electrocatalysis of AA, DA, and UA due to the synergistic effects between P(PDA), GO, and AuNPs. The electro-oxidation signals appeared as three clearly seperated peaks with remarkable peak potential differences of 0.161 V (AA-DA), 0.336 V (AA-UA), and 0.175 V (DA-UA). The linear responses of AA, DA, and UA were in the concentration ranges of 6.0 to 2400.0, 0.05 to 100.0, and 0.5 to 150.0 A mu mol L-aEuro'1 with the detection limits of 1.764, 0.017, and 0.160 A mu mol L-aEuro'1, respectively. The sensor was used for the voltammetric determination of AA, DA, and UA in human urine samples using the standard addition method with satisfactory results.
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• 出版日期2017-5