Au nanoparticles decorated reduced graphene oxide for the fabrication of disposable nonenzymatic hydrogen peroxide sensor

• Au/rGO nanocomposite was synthesized by simultaneous reduction of GO and Au+ 3.
• Nonenzymatic hydrogen peroxide sensor was developed based on Au/rGO.
• The sensor has remarkable electrocatalytic activity to hydrogen peroxide in neutral pH.
• The sensor exhibited very high sensitivity 1238 μA mM− 1 cm− 2 and good selectivity.

A simple approach is followed for the fabrication of disposable nonenzymatic hydrogen peroxide (H2O2) sensor using gold nanoparticles decorated reduced graphene oxide (Au/rGO) nanocomposite. Au/rGO nanocomposite was prepared by one pot reduction of graphene oxide and Au(III) ions. The composite was characterized using various spectroscopic and microscopic techniques. The Au/rGO nanocomposite suspension was cast on the indigenously fabricated screen printed electrode (SPE). Voltammetric studies on the modified electrode showed that the Au/rGO nanocomposite modified SPE have enhanced catalytic activity towards H2O2. The sensor exhibited linear relationship in the range from 20 μM to 10 mM with a sensitivity of 1238 μA mM− 1 cm− 2 and a limit of detection 0.1 μM. The sensor also showed excellent selectivity in presence of other electroactive species such as ascorbic acid, dopamine, glucose and uric acid.

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