Design of L-Cysteine Functionalized Au@SiO2@Fe3O4/Nitrogen-doped Graphene Nanocomposite and Its Application in Electrochemical Detection of Pb2+

doi:10.1007/s40242-017-7101-2

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (6): 951-957.doi: 10.1007/s40242-017-7101-2

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Design of L-Cysteine Functionalized Au@SiO₂@Fe₃O₄/Nitrogen-doped Graphene Nanocomposite and Its Application in Electrochemical Detection of Pb²⁺

NIE Jing¹, HE Bin¹, CHENG Yanmei¹, YIN Wei¹, HOU Changjun², HUO Danqun², QIAN Linlin¹, QIN Yunan¹, FA Huanbao¹

1. National-municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China;
2. Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, P. R. China

Received:2017-03-16 Revised:2017-06-02 Online:2017-12-01 Published:2017-06-21
Contact: YIN Wei,E-mail:huanbaofa@cqu.edu.cn;FA Huanbao,E-mail:yinweicqu@163.com E-mail:huanbaofa@cqu.edu.cn;yinweicqu@163.com
Supported by:
Supported by the National Natural Science Foundation of China(No.31101284), the Graduate Research and Innovation Foundation of Chongqing, China(No.CYS17017), the Fundamental Research Funds for the Central Universities of China (Nos. CQDXWL-2012-034, CQDXWL-2012-035, CDJPY12220001) and the Chongqing University Student Research Training Program, China(Nos.CQU-SRTP-2015497, CQU-SRTP-2015502).

Abstract

Abstract: A novel magnetic electrochemical sensor was designed for determination of lead ions based on gold nanoparticles(AuNPs)@SiO₂@Fe₃O₄/nitrogen-doped graphene(NG) composites functionalized with L-cysteine. The Au@SiO₂@Fe₃O₄/NG was synthesized by the electrostatic adsorption between AuNPs and SiO₂-coated Fe₃O₄NPs(SiO₂@Fe₃O₄) and the amide bond between Au@SiO₂@Fe₃O₄ and NG. L-Cysteine was successfully functionalized on the surface of Au@SiO₂@Fe₃O₄/NGnanocomposites via the S-Au bond between L-cysteine and AuNPs. Owing to numerous active sites in L-cysteines and high conductivity of Au@SiO₂@Fe₃O₄/NG composites, the proposed electrochemical sensor exhibited a well-distributed nanostructure and high responsivity toward Pb(Ⅱ). The sensor linearly responded to Pb²⁺ concentration in the range of 5-80 μg/L with a detection limit of 0.6μg/L, indicating that this L-cysteine functionalized Au@SiO₂@Fe₃O₄/NG composite could be a promising candidate material for the detection of Pb²⁺.

Key words: Electrochemical sensor, Lead, Nitrogen-doped graphene, Au@SiO₂@Fe₃O₄, L-Cysteine

NIE Jing, HE Bin, CHENG Yanmei, YIN Wei, HOU Changjun, HUO Danqun, QIAN Linlin, QIN Yunan, FA Huanbao. Design of L-Cysteine Functionalized Au@SiO₂@Fe₃O₄/Nitrogen-doped Graphene Nanocomposite and Its Application in Electrochemical Detection of Pb²⁺[J]. Chemical Research in Chinese Universities, 2017, 33(6): 951-957.

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Design of L-Cysteine Functionalized Au@SiO₂@Fe₃O₄/Nitrogen-doped Graphene Nanocomposite and Its Application in Electrochemical Detection of Pb²⁺

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