Electrochemical characterization of Au/ZnO/PPy/RGO nanocomposite and its application for simultaneous determination of ascorbic acid, epinephrine, and uric acid
A new electrochemical sensor has been developed based on the reduced graphene oxide (RGO)/polypyrrole (PPy)/zinc oxide (ZnO)/gold (Au) nanoparticles nanocomposite modified glassy carbon electrode (GCE) for simultaneous determination of ascorbic acid (AA), epinephrine (EP), and uric acid (UA). The mo...
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Published in: | Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2017-09, Vol.801, p.466-479 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | A new electrochemical sensor has been developed based on the reduced graphene oxide (RGO)/polypyrrole (PPy)/zinc oxide (ZnO)/gold (Au) nanoparticles nanocomposite modified glassy carbon electrode (GCE) for simultaneous determination of ascorbic acid (AA), epinephrine (EP), and uric acid (UA). The morphology and structure of Au/ZnO/PPy/RGO nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The Au/ZnO/PPy/RGO/GCE-based sensor exhibited excellent electrocatalytic activity and high stability for determination of AA, EP, and UA. The prepared electrode separates the oxidation peak potential of AA-EP by 130mV, and EP-UA by 150mV, while the bare GCE cannot resolve them. Simultaneous determination of these species in their mixture solution showed a wide linear response 2–950μM, 0.6–500μM and 1.0–680μM for AA, EP, and UA, respectively. The detection limits of AA, EP, and UA were also calculated as 0.16, 0.06 and 0.09μM (S/N=3), respectively. In addition, the proposed sensor shows good selectivity and stability along with good precision and consistency.
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•The synergistic effect of four components (Au/ZnO/PPY/RGO) effectively enhanced the current response of the proposed sensor.•ZnO/PANI/RGO nanocomposite has been characterized by FE-SEM, XPS, XRD and Raman spectroscopy•The sensor was employed for simultaneous determinations of AA, EP and UA.•Excellent electrocatalytic activity towards AA, EP and UA was achieved.•The electrode was effectively used for the determination of AA, EP and UA in real samples. |
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ISSN: | 1572-6657 1873-2569 |
DOI: | 10.1016/j.jelechem.2017.07.024 |