Fabrication and application of Ag-Ag2S/MoS2-based composite for nonenzymatic electrochemical detection of hydrogen peroxide

被引：0

作者：

Xu D. ^{[1
]}

Jiang Y. ^{[2
]}

Zeng K. ^{[1
]}

Luan R. ^{[1
]}

Liu S. ^{[1
]}

Li Y. ^{[1
]}

Zhu S. ^{[1
]}

机构：

[1] State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai

[2] Shanghai Institute of Space Power-Sources, Shanghai

来源：

Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2019年 / 49卷 / 12期

关键词：

Enzyme-free electrochemical sensing; Hydrogen peroxide; Molybdenum disulfide; Silver; Silver sulfide;

D O I：

10.1360/SST-2019-0049

中图分类号：

学科分类号：

摘要：

In this study, novel Ag-Ag2S/MoS2 composites were designed and prepared for the nonenzymatic electrochemical detection of hydrogen peroxide. The composites were obtained by the self-assembly of a MoS2 aqueous solution and Ag nanodispersions. In the composite, the multilayered MoS2 was distributed as a petal shape, and Ag-Ag2S nanoparticles (NP) with a size of 30 nm × 20 nm were uniformly grown on the petal-like layer. Low-content Ag2S existed mainly at the interface between the Ag NPs and the MoS2 sheets. The Ag-Ag2S/MoS2 composite modified electrode exhibited a good enzyme-free electrochemical sensing performance for H2O2 with an extremely wide linear range of 0.01-160 mmol/L, a good sensitivity of 17.1 μA (mmol/L)-1 cm-2, and a minimum detection limit of 4.8 μmol/L. The excellent sensing properties of the composite were probably due to the synergistic effect of the combination of Ag, Ag2S nanoparticles, and MoS2. Not only did Ag and 1T-phase MoS2 have better catalytic activity than hydrogen peroxide, but they could also significantly improve the conductive properties of the composites. A small amount of Ag2S also provided a pathway for electron transport between Ag and MoS2. The sensor based on Ag-Ag2S/MoS2 composite also exhibited good catalytic activity, excellent selectivity, good stability, and reproducibility. © 2019, Science Press. All right reserved.

引用

页码：1495 / 1506

页数：11

共 31 条

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