Citation: Song-Song YANG, Lu HAN, He-Qing CAI, Kun HU, Ru-Ping LIU, Zhi-Cheng SUN, Yan WEI. In situ synthesis of Ag NPs/MoS₂ composites via microwave and their electrochemical properties[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(10): 1848-1856. doi: 10.11862/CJIC.2023.155 shu

In situ synthesis of Ag NPs/MoS₂ composites via microwave and their electrochemical properties

Song-Song YANG ¹ ,
Lu HAN ^1,, ,
He-Qing CAI ¹ ,
Kun HU ¹ ,
Ru-Ping LIU ¹ ,
Zhi-Cheng SUN ¹ ,
Yan WEI ^2,,

1.
School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, China
2.
Key Laboratory of Organophosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100084, China

Corresponding author: Lu HAN, hanlu@iccas.ac.cn Yan WEI, weiyen@tsinghua.edu.cn
Received Date: 3 May 2023
Revised Date: 28 August 2023

Figures(7)

Molybdenum disulfide nanosheets (MoS₂) are affected by charged impurities, structural defects and traps, and their easy aggregation leads to the deterioration of their electron transfer performance, which limits their application. In this study, Ag NPs/MoS₂ composites were prepared by combining a few layers of MoS₂ nanosheets with silver nanoparticles (Ag NPs), in order to improve the electrochemical performance of MoS₂ nanosheets. Firstly, the low-layer MoS₂ nanosheets were prepared by ultrasonic assisted liquid phase stripping method, and then the Ag NPs/MoS₂ composites were prepared by microwave reduction method. After Ag NPs/MoS₂ composites were modified onto screen printed electrodes (SPE), the peak current of cyclic voltammetry (CV) curve was 1.8 times of that of MoS₂ modified SPE, and the peak current of square wave voltammetry (SWV) curve was 3.4 times of that of MoS₂ modified SPE. The electron transfer impedance (R_et) of electrochemical impedance spectroscopy (EIS) was only 167 Ω, which was significantly lower than that of MoS₂/SPE (320 Ω), indicating that compared to that of MoS₂ nanosheets, the electrochemical performance of Ag NPs/MoS₂ composites is significantly enhanced. Subsequently, the conductive mechanism of the highly conductive Ag NPs/MoS₂ composites was also speculated. Finally, an electrochemical sensor was constructed based on Ag NPs/MoS₂ composites and used for the detection of prostate specific antigen (PSA). The results showed that the detection limit of the sensor for PSA was 0.009 ng·mL^-1, the linear detection range was 0.1~1 000 ng·mL^-1, and the sensitivity was 0.011 μA·mL·ng^-1.
- in situ synthesis via microwave,
- MoS₂,
- Ag NPs/MoS₂ composites,
- electrochemical performance
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In situ synthesis of Ag NPs/MoS₂ composites via microwave and their electrochemical properties