Synthesis and enhanced electrochemical properties of AuNPs@MoS2/rGO hybrid structures for highly sensitive nitrite detection

• Published in: Microchemical journal Vol. 172; p. 106904
• Main Authors: Yang, Ying, Lei, Qian, Li, Jun, Hong, Cheng, Zhao, Zhenting, Xu, Hongyan, Hu, Jie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2022
• Subjects: Electrochemical properties; Gold nanoparticles; Molybdenum disulfide; Nitrite sensor; Reduced graphene oxide; Electrochemical properties; Molybdenum disulfide; Reduced graphene oxide; Gold nanoparticles; Nitrite sensor
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2021.106904

An ultra-high sensitive nitrite electrochemical sensor was developed by an efficient hybrid structure, which is constructed by modification gold nanoparticles on molybdenum disulfide and reduced graphene oxide (AuNPs@MoS2/rGO). The as-prepared Au4.5NPs@MoS2/rGO sensor shows the sensing parameters include ultra-high sensitivity (0.805 μA·μM−1·cm−2), low detection limit (0.038 μM (S/N=3)), wide linear range (0.2 μM-2600 μM), fast response time (3 s) and long-term stability. [Display omitted] •A highly sensitive nitrite sensor was developed based on AuNPs@MoS2/rGO hybrid nanostructure.•The concentrations of gold nanoparticles modification on the surface of MoS2/rGO hybrid nanostructure were optimized toward nitrite detection.•The as-developed Au4.5NPs@MoS2/rGO electrochemical sensor displays high sensitivity (0.805 μA·μM−1·cm−2), low detection limit (0.038 μM) and good linear detection range (0.2 μM-2600 μM).•The enhanced electrochemical properties of Au4.5NPs@MoS2/rGO sensor can be attributed to the synergistic catalytic effect of MoS2/rGO and excellent catalyticpropertiesof Au nanoparticles. The electrochemical nitrite sensors based on nanomaterials have attracted great attention because of their destructive effect on both environment and human health. Herein, gold nanoparticles modified molybdenum disulfide and reduced graphene oxide (AuNPs@MoS2/rGO) based nitrite sensor has been proposed combing a facile hydrothermal and chemical reduction methods. To optimize the electrochemical performances, the as-fabricated AuNPs@MoS2/rGO sensors with different contents of gold have been systematic investigated toward nitrite detection by cyclic voltammograms and amperometry techniques. The measured results demonstrated that the as-prepared Au4.5NPs@MoS2/rGO sensor exhibits high sensitivity (0.805 μA·μM−1·cm−2), short response time (3 s), low detection limit (0.038 μM (S/N = 3)) and good linear detection range (0.2 μM-2600 μM). Meanwhile, it also displays excellent selectivity and good long-term stability toward nitrite. Finally, the excellent electrochemical performances of Au4.5NPs@MoS2/rGO nitrite sensor not only can be attributed to the synergistic effect between MoS2 and rGO nanosheets, but also ascribed to the excellent catalyticpropertyof suitable content of Au nanoparticles.