期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 231, 期 -, 页码 70-78出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.03.009
关键词
Au-Cu bimetallic nanoparticles; Electrochemical determination; Arsenic(III); XAFS
资金
- National Basic Research Program of China [2011CB933700, 2013CB934300]
- National High Technology Research and Development Program of China (863 Program) [2013AA065602]
- National Natural Science Foundation of China [21475133, 21377131, 61474122, 51202052, U1532123, 11405256, U1532120]
- Shanghai Municipal Natural Science Foundation [13ZR1447800]
- Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure [SKL201312SIC]
Bimetallic nanoparticles provide a new opportunity for enhancing electrocatalytic activity because of some possible synergetic effects. In this study, different compositions of Au-Cu bimetallic nanoparticles are prepared via a simple hydrothermal method. The structure of Au-Cu bimetallic nanoparticles is characterized by using X-ray absorption fine structure (XAFS) techniques, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The correlations between electrochemical performance and the compositions of Au-Cu bimetallic nanoparticles on the determination of arsenic(III) are investigated through square wave anodic stripping voltammetry (SWASV). It is found that the amount of copper (Cu) in Au-Cu bimetallic nanoparticles is critical to the detection of arsenic(III). The XAFS results indicated that the Au-Au bond length (RAu-Au) can be influenced by the Cu concentration in the materials. Different RAu-Au of Au-Cu nanoparticles lead to the different electrochemical catalytic activity toward arsenic(III), further revealing the different electrochemical behavior. Compared with Au nanoparticles and commercial Au electrode, the Au-Cu bimetallic nanoparticles showed enhanced electrochemical performance with high sensitivity at ppb level, low detection limit. Moreover, the Au89Cu11 bimetallic nanoparticles exhibited ultra-high anti-interference performance on the detection of arsenic(III). (C) 2016 Elsevier B.V. All rights reserved.
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