Simultaneous Electrochemical Detection of Nitrite and Hydrogen Peroxide Based on 3D Au-rGO/FTO Obtained Through a One-Step Synthesis.

ABSTRACT: In this paper, Au and reduced graphene oxide (rGO) were successively deposited on fluorine-doped SnO? transparent conductive glass (FTO, 1 × 2 cm) via a facile and one-step electrodeposition method to form a clean interface and construct a three-dimensional network structure for the simultaneous detection of nitrite and hydrogen peroxide (H?O?). For nitrite detection, 3D Au-rGO/FTO displayed a sensitivity of 419 ?A mM^-1 cm^-2 and a linear range from 0.0299 to 5.74 mM, while for the detection of H?O?, the sensitivity was 236 ?A mM^-1 cm^-2 and a range from 0.179 to 10.5 mM. The combined results from scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray diffraction measurements (XRD) and electrochemical tests demonstrated that the properties of 3D Au-rGO/FTO were attributabled to the conductive network consisting of rGO and the good dispersion of Au nanoparticles (AuNPs) which can provide better electrochemical properties than other metal compounds, such as a larger electroactive surface area, more active sites, and a bigger catalytic rate constant.

SUBMITTER: Li C 

PROVIDER: S-EPMC6471323 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature