Preparation of flower-like Pt nanoparticles decorated chitosan-grafted graphene oxide and its electrocatalysis of hydrazine

In this paper, a novel graphene oxide/chitosan/platinum (GO/CTS/Pt) nanocomposite was successfully synthesized by using CTS as protective agent and dispersant. Further, a hydrazine electrochemical sensor was constructed by immobilizing GO/CTS/Pt nanocomposites on a glassy carbon electrode (GCE). The morphology and composition of the nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The electrochemical investigations indicated that the GO/CTS/Pt modified GCE showed excellent electrocatalytic ability towards the oxidation of hydrazine. The current responses of the GO/CTS/Pt modified GCE towards the addition of hydrazine showed a wide linear range from 2.0 × 10−5 to 1.0 × 10−2 mol L−1 at a low applied potential of 0 V (versus SCE), and the low detection limit was 3.6 μmol L−1 at the signal-to-noise ratio of 3. Moreover, the sensor also exhibited good reproducibility, stability and selectivity for hydrazine sensing. This study suggests that the GO/CTS/Pt nanocomposites might be further applied to other fields with great potential.