Abstract
Reduced graphene oxide modified with gold nanoparticles (Au/rGO) was synthesized and used for nonenzymatic electrochemical detection of glucose in a neutral medium. Graphene oxide (GO) was synthesized by modified Hummer's method. Electrocatalyst Au/rGO nanocomposite was synthesized by the simultaneous reduction of gold ions and graphene oxide in a one-pot wet chemical method. Spectroscopic, morphological, and elemental characterizations confirmed the presence of gold nanoparticles (AuNPs) on the surface of reduced graphene oxide. The characteristic surface plasmon resonance band of Au nanoparticle was observed at 540 nm in the composite. The Au/rGO nanocomposite was dispersed in DMF and cast on the screen-printed carbon electrode. The Au/rGO modified electrode was found to catalyze the electrooxidation of glucose in a neutral medium. The sensor exhibited a linear increase in current response with an increase in the concentration of glucose up to 60 mM and a sensitivity of 245µA mM−1 cm−2. The wide linear range, good sensitivity, and capability to oxidize glucose at neutral pH make the Au/rGO nanocomposite modified electrode a promising candidate for the sensing of glucose in real-time.
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