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A SILAR method for the fabrication of layer-by-layer assembled Cu2O-reduced graphene oxide composite for non-enzymatic detection of hydrogen peroxide

Hydrogen peroxide (H2O2) is an important synthetic precursor as well as degradation product of many peroxide-based explosives. Herein, a facile method for the synthesis of Cu2O-reduced graphene oxide (CRGO) composite has been demonstrated which would be used as active electrode material for the detection of H2O2. Successive Ionic Layer Adsorption and Reaction (SILAR) mechanism for the synthesis of layer-by-layer (LbL) assembly has been undertaken to yield homogenously anchored Cu2O NPs over large surface of reduced graphene oxide (RGO). Fourier transform infrared and x-ray photoelectron spectroscopic studies revealed the removal of oxygen functionalities from graphene oxide (GO) and the successful formation of RGO. X-ray diffraction studies confirms the formation of Cu2O NPs. Microscopic characterization was carried out by field emission scanning electron (FESEM) and transmission electron microscopy (TEM) which revealed the successful decoration of graphene surface homogenously by Cu2O NPs. The electrochemical characterization was carried out through cyclic voltammetry and chronoamperometry, which suggested the utilization of CRGO composite for the detection of H2O2 with a sensitivity of 74.99 μA μM−1 cm−2 and the LoD of 1.05 nM. The interference test suggested superior selectivity of the composite for H2O2 against various other analytes.