Facile Synthesis and Electrochemical Performance of Graphene-Modified Cu2O Nanocomposite for Use in Enzyme-Free Glucose Biosensor

Document Type: Research Article

Authors

1 Materials Science and Engineering, Faculty of Engineering, Shiraz University, Shiraz, I.R. IRAN

2 Department of Chemistry, Seoul National University, Seoul, KOREA

Abstract

Graphene-modified Cu2O nanocomposite was synthesized under a facile microwave irradiation of an aqueous solution and has been investigated as an enzyme-free glucose biosensor. Morphology and crystal structure of the graphene-modified Cu2O nanocomposite were investigated by using electron microscopy and X-ray diffraction (XRD) analyses. Also, the electrochemical performance of the graphene-modified Cu2O nanocomposite for the measurement of glucose concentration in alkaline media was evaluated by using cyclic voltammetry and chronoamperometric measurements. The electrochemical studies revealed that graphene-modified nanocomposite electrode exhibited a high performance for non-enzymatic oxidation of glucose with a desirable sensitivity. Also, the fabricated graphene-modified biosensor exhibited a wide linear response for glucose detection in the concentrations ranges from 2 µM to 12 mM and a desirable detection limit of 2 µM. In addition, the graphene-modified Cu2O nanocomposite provided an appropriate selective response for glucose detection in presence of high concentrations of ascorbic acid and dopamine.

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