MnO2/reduced graphene oxide nanoribbons: Facile hydrothermal preparation and their application in amperometric detection of hydrogen peroxide

In the present work, graphene oxide nanoribbons (GONRs) were synthesized via the longitudinal unzipping of multi-walled carbon nanotubes (MWCNTs) nanoparticles with the aid of strong oxidants. The MnO2/reduced graphene oxide Nanoribbons (MnO2/rGONRs) composites were successfully fabricated by means of a reproducible and single-step hydrothermal co-reduction of KMnO4 and GONRs. The morphology and composition of as-prepared materials were studied by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD). The as-prepared MnO2/rGONRs were employed in fabricating a nonenzymatic electrochemical sensor for the sensitive detection of hydrogen peroxide (H2O2). The electrochemical properties of the MnO2/rGONRs modified glassy carbon electrode (MnO2/rGONRs/GCE) were studied by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The developed nonenzymatic electrochemical sensor exhibited well-defined amperometric response towards H2O2 in a wide linear range of 0.25-2245 μM, and a detection limit of 0.071 μM (S/N = 3) could be obtained. And the proposed sensor also displayed excellent electrochemical analytical performance, acceptable reproducibility, high accuracy, and great anti-interference ability. The proposed sensor was applied for the determination of H2O2 in real sample of fetal bovine serum (FBS), and acceptable accuracy and recovery could be obtained.