Introducing a novel nanocomposite consisting of TiO 2 nanoparticles@copper oxide/reduced graphene oxide for the electroc
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ORIGINAL PAPER
Introducing a novel nanocomposite consisting of TiO2 nanoparticles@ copper oxide/reduced graphene oxide for the electrocatalytic sensing of ascorbic acid Mohammad Hossein Ghanbari1 · Mohammad Hossein Mashhadizadeh1 · Zahra Norouzi2 Received: 16 July 2020 / Accepted: 1 November 2020 © Iranian Chemical Society 2020
Abstract In the present work, titania nanoparticles ( TiO2NPs), copper oxide (CuO), and reduced graphene oxide (rGO) ternary nanocomposite (TiO2NP@CuO-rGO)-modified glassy carbon electrode (GCE) have been used for sensitive detection and determination of ascorbic acid (AA). The modified glassy carbon electrode was characterized over the successive modification steps, by scanning electron microscope (SEM) imaging, FT-IR spectroscopy, XRD, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Electrochemical detection and determinations were made using differential pulse voltammetry (DPV), and the amount of ternary nanocomposite ( TiO2NP@CuO-rGO), the effect of pH, and potential scan rate were optimized. The electrochemical properties of the AA at the proposed modified electrode were monitored by performing CV experiments. The DPVs and CVs displayed one oxidation peak during the anodic potential scan. The electrochemical detection and determination by DPV provided a linear concentration range from 10.0 pM to 10.0 μM with a limit of detection (LOD) 3.0 pM. The TiO2NP@CuO-rGO/GCE sensor demonstrated good reproducibility, stability, and repeatability and no interference in the electrochemical detection and determination of AA in the presence of many compounds. The suggested method was satisfactory practical for the detection and determination of AA in human synthetic blood serum samples, with recoveries about 99.2%.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13738-020-02114-7) contains supplementary material, which is available to authorized users. * Mohammad Hossein Ghanbari [email protected] 1
Faculty of Chemistry, Kharazmi University, 15719‑14911 Tehran, Iran
Faculty of Chemistry, University of Kashan, 87317‑51167 Kashan, Iran
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Vol.:(0123456789)
Journal of the Iranian Chemical Society
Graphic abstract Titania nanoparticles@copper oxide–reduced graphene oxide: TiO2NP@CuO-rGO. Applicability of the TiO2NP@CuOrGO nanocomposite in fabrication of an efficient ascorbic acid (AA) sensor based on the use of a glassy carbon electrode.
Keywords Electrochemical sensor · Ascorbic acid · TiO2 nanoparticles · Copper oxide · Reduced graphene oxide · TiO2NP@CuO-rGO nanocomposite
Introduction The basic biologically active form of vitamin C is L-ascorbic acid (AA) (Scheme 1S). The biological activity of this vitamin is manifested as well as in its oxidation product, dehydroascorbic acid. While this vitamin is an essential watersoluble vitamin in human nutrition, humans do not have the necessary enzymes for its synthesis, albeit more animals can synthesize vitamin C from d-glucose. For the last s
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