Electrochemical approach for nonenzymatic glucose sensing with noble metal-free 2D graphene-based ternary nanocomposite

Abstract

The present work demonstrates a new nanocomposite of ZnO, SnO2, and Graphene, which is more effective and inexpensive for glucose detection than existing materials. Further, ZnO and SnO2 is a desirable selection for glucose sensing application because of its advantageous characteristics, which include high adsorption capacity, broad surface area, good catalytic activity, promotes effective electron transport, and biocompatibility. These materials were synthesized through a self-assembly method. The synthesized ZnO-G-SnO2 nanocomposite was then assessed through X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), Raman spectroscopy, Energy-dispersive X-ray spectrometry (EDS), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Diffuse Reflectance Spectroscopy (DRS), Photocurrent testing, and Nitrogen adsorption-desorption isotherms. The ZnO-G-SnO2 nanocomposite was used in the fabrication of an enzyme-free biosensor, which displayed good sensitivity and selectivity in glucose solution through cyclic voltammetry. These results indicate that ZnO-G-SnO2 is useful for glucose detection with efficient electrocatalytic activity in the direction of organically significant concentrations with low current density (0.0010 Ma/cm2) and 0.5 mmol/L at the potential from ‐1.0 to 1.0 v. Altogether, this nanocomposite biosensor can detect glucose accurately and with good sensitivity.