Sensitive Detection of Hydroxylamine on Poly(3,4- ethylenedioxythiophene)/graphene Oxide Nanocomposite Electrode

Abstract

A stable and sensitive hydroxylamine (HA) sensor was developed through a simple one-step electropolymerization of a thin poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO) film onto a glassy carbon electrode (GCE) surface (PEDOT/GO/GCE). The sensors were characterized by SEM, FT-IR and UV-vis spectra. The electrochemical performance of the PEDOT/GO/GCE for detection of HA was investigated by cyclic voltammetry and chronamperometry. The PEDOT/GO electrode displayed a synergistic effect of conducting PEDOT and high surface area of GO towards the oxidation of HA, showed higher oxidation current compared with GO/GCE, PEDOT/GCE and bare electrodes. The oxidation of HA on the PEDOT/GO films depended strongly on the solution pH, and the maximum catalytic current was observed at a pH of 8.0. The amperometric response at PEDOT/GO electrode increased linearly to HA concentrations in the range of 0.1 μM to 6 mM, and the detection limit was 0.04 μM. Furthermore, the modified electrode was successfully used for determination of spiked hydroxylamine in water sample. Finally, the modified electrode exhibited good reproducibility and long-term stability, as well as high selectivity.