In situ formation of N-doped carbon film-immobilized Au nanoparticles-coated ZnO jungle on indium tin oxide electrode for excellent high-performance detection of hydrazine

Publication date: May 2017
Source:Sensors and Actuators B: Chemical, Volume 243
Author(s): Yong Zhang, Tianyi Han, Ziying Wang, Chen Zhao, Jianning Li, Teng Fei, Sen Liu, Geyu Lu, Tong Zhang
Herein, a novel electrochemical hydrazine sensor has been successfully fabricated using N-doped carbon film-immobilized Au nanoparticles coated ZnO jungle on indium tin oxide (AuNPs@NC-ZnO/ITO) as working electrode. The AuNPs@NC-ZnO/ITO has been prepared by an in situ synthesis method through the following steps. Firstly, the ZnO jungle modified ITO was prepared by electrochemical deposition method. Then, zeolitic imidazolate framework-8 (ZIF-8) film was formed on the surface of ZnO jungle by wet-chemical method using ZnO jungle and 2-methylimidazole as Zn precursor and organic ligand, respectively. The loading AuNPs was performed by adsorption of Au³⁺ into micropores of ZIF-8, followed by heat treatment under N2 atmosphere, where the ZIF-8 converted into N-doped carbon and Au³⁺ converted into AuNPs embedded in N-doped carbon film. Most importantly, such AuNPs@NC-ZnO/ITO exhibited good electrocatalytic activity for the oxidation of hydrazine. The hydrazine sensor based on AuNPs@NC-ZnO/ITO showed linear detection range from 0.05 to 10μM and detection limit of 4.1nM at a signal-to-noise ratio of 3.

Graphical abstract

http://ift.tt/2ibea28