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One Step Green Preparation of Graphene/ZnO Nanocomposite for Electrochemical Sensing

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A disposable electrochemical sensor for determination of hydrogen peroxide (H2O2) was developed based on graphene/zinc oxide (ZnO) nanocomposite-modified screen printed carbon electrode (SPCE). The method adopted is facile, cost effective and avoids the conventional usage of harsh oxidants and acids. Graphite was exfoliated into graphene sheets via liquid phase exfoliation with the aid of ultrasonication, without going through the intermediate graphene oxide phases that can disrupt the pristine structure of the yield. The as-prepared graphene/ZnO nanocomposite was comprehensively characterized to investigate its morphology, crystallinity, composition, thickness and purity. The results clearly indicate that graphite was successfully exfoliated into graphene sheets and ZnO nanoparticles were well dispersed on the surface of graphene sheets. The electrochemical performance of the graphene/ZnO nanocomposite-modified SPCE was evaluated via cyclic voltammetry (CV) and amperometric technique. The resulting electrode displays excellent electrocatalytic activity towards the reduction of H2O2 in a linear range of 1 to 15 mM with a correlation coefficient of 0.9859. The facile and green approach used for the preparation of graphene/ZnO nanocomposite may open up new horizons in the production of cost-effective biosensors.
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Keywords: Electrochemical Sensor; Graphene/ZnO Nanocomposite; Hydrogen Peroxide; Screen-Printed Carbon Electrode; Sonochemical Facile Synthesis

Document Type: Research Article

Affiliations: 1: Department of Electrical and Electronic Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia 2: School of Biosciences, Faculty of Science, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia 3: Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University Malaya, 50603 Kuala Lumpur, Malaysia

Publication date: July 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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