Graphene Based Electrode for Electrochemical Sensing Application

Wong, Sie Mein (2017) Graphene Based Electrode for Electrochemical Sensing Application. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Graphene (GR) is a carbon material with carbon atoms parked in a two-dimensional honey lattice, which has attracted tremendous amount of attention due to its extraordinary physical, chemical and mechanical properties. Besides, due to its low-cost, large specific surface area and strong interactions with metal clusters, graphene is a promising material for catalytic applications. This work presents modified electrodes with graphene based material as the non-enzymatic glucose sensor. Three types of modification were applied to the electrode. Firstly, the glassy carbon electrode was coated with graphene (GR) synthesized by sonochemical-assisted solvent graphene exfoliation approach in ethanol-water mixture. Secondly, the glassy carbon electrode was coated with reduced Grephene Oxide (RGO) synthesized by exfoliating graphite oxide to reduced graphene oxide sheets by ultrasonication and reduction process using sodium hydroxide (NaOH). Thirdly, the glassy carbon electrode was coated with copper oxide/reduced graphene oxide (CuO/RGO) nanocomposite. The CuO/RGO nanocomposite was prepared by a one-step chemical procedure using copper acetate-adsorbed graphene oxide (GO) as precursors. The properties and performance of the samples produced by different methods were compared. The morphology of the as-prepared GR, RGO and CuO/RGO nanocomposite were characterized by Scanning Electron Microscopy, UV-Vis spectroscopy and Energy Dispersive X-Ray (EDX) analysis. The electrochemical performance of the GR, RGO and CuO/RGO modified glassy carbon electrodes for glucose sensing was investigated by cyclic voltammetry (CV). The CuO/RGO modified electrode was found to demonstrate enhanced electrocatalytic response of more than two-fold as compared to GR and RGO electrodes, while more than four-fold as compared to the bare glassy carbon electrode.