Abstract
Sensitive and selective detection of Hg(II) contamination is of great importance with concern of public health. Herein, we successfully fabricated monolayer MoS2 (S-MoS2) decorated Cu7S4-Au (Cu7S4-Au@S-MoS2) nanocomposite modified electrode for the sensitive and selective detection of Hg(II) via anodic stripping voltammetric technique. Due to the excellent electrocatalytic reduction performance arisen from the abundant active edge sites of smallmonolayer MoS2 and good affinity of Au toward Hg, the current method displayed high sensitivity (LOD = 190 nmol L−1) and enhanced selectivity. As control, nanostructures including Cu7S4-Au, Cu7S4@S-MoS2 and Cu7S4-Au@M-MoS2 (M: multilayer) were also investigated, but showed low response to Hg(II), suggesting that both Au domains and active edge sites of monolayer MoS2 have crucial synergistic effects on the high-performance for recognition of Hg(II). Moreover, the developed method displays satisfied performance for the detection of Hg(II) in real samples, which indicates its potentials in practical applications.
摘要
汞的灵敏选择性检测对于人类的公共安全至关重要. 本文成功制备了单层二硫化钼修饰的Cu7S4-Au纳米结构(Cu7S4-Au@S-MoS2), 通过阳极溶出伏安法实现了对汞的灵敏选择性分析检测. 基于超小(<10 nm)单层MoS2丰富的活性位点及金对汞的良好亲和性, 该方法灵 敏度高(检出限为190 nmol L−1)、选择性好(常见Cd2+、Pb2+、Cu2+等均无干扰), 并成功用于实际样品中汞的灵敏分析. 研究发现Cu7S4-Au与 Cu7S4@S-MoS2 对Hg(II) (1.0 μmol L−1)无响应, 而多层MoS2修饰的Cu7S4-Au(Cu7S4-Au@M-MoS2)对Hg(II) (1.0 μmol L−1) 有弱响应, 结果表明 超小单层MoS2丰富的活性位点及金对汞的良好亲和性对分析检测起到了协同催化作用.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (21475007 and 21675009) and the Fundamental Research Funds for Central Universities (buctrc201507 and buctrc201608). We also thank the support from the “Public Hatching Platform for Recruited Talents of BUCT”.
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Jiabin Cui currently is a PhD candidate in BUCT. His PhD project is focused on the design and fabrication of chalcogenide nanostructures for photoelctrical catalysis, sensing and bioimaging.
Leyu Wang is a professor of chemistry at BUCT. He received his PhD in chemistry from Tsinghua University with Prof. Yadong Li in 2007. Then he joined Prof. Yu Huang’s group at the University of California at Los Angeles (UCLA) as a postdoctoral researcher from 2007–2009. He moved to BUCT’s Chemistry Department in October 2009. His research interests span from the controlled synthesis of upconversion luminescence nanoparticles (UCNPs), localized surface plasmon resonance (LSPR) near-infrared (NIR) semiconductor NPs, magnetic nanomaterials, metal-semiconductor heteronanostructures, and molecularly imprinted polymers (MIPs) nanomaterials to the applications including electrocatalysis, artificial photosynthesis, biochemical sensing, multimodal imaging, drug/gene delivery and photothermo/chemo therapy.
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Cui, J., Xu, S. & Wang, L. Monolayer MoS2 decorated Cu7S4-Au nanocatalysts for sensitive and selective detection of mercury(II). Sci. China Mater. 60, 352–360 (2017). https://doi.org/10.1007/s40843-017-9019-4
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DOI: https://doi.org/10.1007/s40843-017-9019-4