Nanoplatelet MoS2 arrays decorated with Pt nanoparticles for non-enzymatic detection of hydrogen peroxide

Abstract

An electrochemical detection platform for monitoring of hydrogen peroxide was designed based on molybdenum disulphide nanocomposites. Bulk MoS2 as well as flower-like MoS2 sheets on Ti substrate were synthesized via a hydrothermal approach. Monodispersed MoS2 nanoparticles with average size less than 2 nm were fabricated by simple and low-cost ultrasonication and gradient centrifugation method. The MoS2/Ti structures were further assessed for amperometric H2O2 detection. The nanoflower MoS2/Ti electrode were electrochemically designed with highly dense Pt nanoparticles. The structure and surface morphology were subsequently characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and X-ray diffraction (XRD) techniques. The electrochemical behaviours and sensing performances of the MoS2/GC, MoS2/Ti and Pt/MoS2/Ti electrodes were studied by cyclic voltammetry (CV) and chronoamperometry. The MoS2 nanoparticle modified GC electrode displayed excellent sensitivity towards H2O2 at applied voltage of −0.6 V and the best sensitivity of 1.93 μA μM−1 cm−2 was reached with Pt/MoS2/Ti electrodes. The electrodes prepared by using novel hybrid MoS2 nanomaterials showed high sensitivity, selectivity and long-term stability (at least 10 days) for monitoring of H2O2 and, thus, deserve further studies of their application in development of sensors and biosensors.