The preparation of diminished graphene oxide/hemoglobin/CdS biocomposite and its electrocatalysis for the discount of hydrogen peroxide: Fullerenes, Nanotubes and Carbon Nanostructures: Vol 0, No 0

Summary

The rGO/hemoglobin/CdS biocomposite (rGO/Hb/CdS) had been ready by way of a easy route. The water-soluble rGO/CdS composite was synthesized in aqueous resolution with a facile hydrothermal route. CdS nanoparticles (NPs) had been anchored uniformly on the graphene nanosheets. With L-cysteine (Cys) because the molecular linker, the Hb molecules had been then adsorbed onto the CdS NPs to provide the rGO/Hb/CdS biocomposite NPs. The rGO/Hb/CdS was characterised using UV-vis spectroscopy, powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and area emission scanning electron microscopy (FE-SEM). The electrochemical behaviors of rGO/Hb/CdS had been characterised with cyclic voltammetric approach (CV). A pair of well-defined and quasi-reversible cyclic voltammetric peaks was noticed. The cyclic voltammogram demonstrated the direct electron switch of the Fe(III)/Fe(II) couple of Hb. The glassy carbon electrode (GCE) modified with rGO/Hb/CdS shows a wonderful electrocatalytic response to the discount of H₂O₂ with a detection restrict of 6 × 10⁻⁷ M (S/N = 3). A linear calibration curve may be noticed within the vary of 1.9 × 10⁻⁶ ∼ 1.5 × 10⁻⁴ M.