ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

An electrochemical sensor for determination of nitrite based on Au nanoparticles decorated MoS₂ nanosheets

Xin Li, Na Zou, Zhaoxia Wang, Yanli Sun, Hongying Li, Chunping Gao, Tao Wang, and Xueliang Wang

Heze University, Heze, China

E-mail: qust-1977wxl@163.com

Abstract: An electrochemical sensor for the determination of nitrite was successfully fabricated via electro-depositing Au nanoparticles on a glassy carbon electrode (GCE) modified with MoS₂ nanosheets. The morphology and composite of the resulted electrode were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The modified processes of the nanoAu-MoS₂/GCE were monitored by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The amperometric current–time (i–t) showed that the developed electrode had excellent response for sodium nitrite under the optimum conditions, and the oxidative current of sodium nitrite was proportionally correlated with its concentration (10–2100 μM) with a limit of detection (LOD) of 0.09 μM (S/N = 3), which can be employed in the determination of nitrite in river and drinking water with the advantages of good reproducibility, anti-interference, long-term stability and satisfactory recovery rate.

Keywords: Nitrite ; Electrochemical sensor ; Au nanoparticles ; MoS₂ nanosheets ; Application 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-019-00885-9

Chemical Papers 74 (2) 441–449 (2020)