High Sensitivity Electrochemical As (III) Sensor Based on Fe3O4/MoS2 Nanocomposites

Haibing Hu; Yunhu Hu; Baozhu Xie; Jianxiong Zhu

doi:10.3390/nano13162288

High Sensitivity Electrochemical As (III) Sensor Based on Fe₃O₄/MoS₂ Nanocomposites

Nanomaterials (Basel). 2023 Aug 9;13(16):2288. doi: 10.3390/nano13162288.

Authors

Haibing Hu¹, Yunhu Hu¹, Baozhu Xie¹, Jianxiong Zhu^{2

3}

Affiliations

¹ Academy of Opto-Electric Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Collaborative Innovation Center of Advanced Display Technology, Anhui Key Laboratory of Advanced Imaging and Display Technology, Opto-Electric Display Industry Innovation Center, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China.
² School of Mechanical Engineering, Southeast University, Nanjing 211189, China.
³ Engineering Research Center of New Light Sources Technology and Equipment, Ministry of Education, Nanjing 211189, China.

Abstract

Currently, heavy metal ion pollution in water is becoming more and more common, especially As (III), which is a serious threat to human health. In this experiment, a glassy carbon electrode modified with Fe₃O₄/MoS₂ nanocomposites was used to select the square wave voltammetry (SWV) electrochemical detection method for the detection of trace As (III) in water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that Fe₃O₄ nanoparticles were uniformly attached to the surface of MoS₂ and were not easily agglomerated. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed that Fe₃O₄/MoS₂ has higher sensitivity and conductivity. After optimizing the experimental conditions, the Fe₃O₄/MoS₂-modified glassy carbon electrode exhibited high sensitivity (3.67 μA/ppb) and a low detection limit (0.70 ppb), as well as excellent interference resistance and stability for As (III).

Keywords: As (III) detection; electrochemical analysis method; electrochemical sensors.

Grants and funding

This study was supported by the Fundamental Research Funds for the Central Universities 2242023K30035. This study was supported by the “University-Industry Collaborative Education Program by the Ministry of Education” with no. 220903844181929 and 3502002207, and by the National Natural Science Foundation of Jiangsu Province with no. BK20221456.