Design of L-cysteine functionalized Au@SiO2@Fe3O4/nitrogen-doped graphene nanocomposite and its application in electrochemical detection of Pb2+

Jing Nie; Bin He; Yanmei Cheng; Wei Yin; Changjun Hou; Danqun Huo; Linlin Qian; Yunan Qin; Huanbao Fa

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

Article

Design of L-cysteine functionalized Au@SiO₂@Fe₃O₄/nitrogen-doped graphene nanocomposite and its application in electrochemical detection of Pb²⁺

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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 Fe₃O₄ NPs(SiO₂@Fe₃O₄) and the amide bond between Au@SiO₂@Fe₃O₄ and NG. L-Cysteine was successfully functionalized on the surface of Au@SiO₂@Fe₃O₄/NG nanocomposites 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 0.6 μg/L, indicating that this L-cysteine functionalized Au@SiO₂@Fe₃O₄/NG composite could be a promising candidate material for the detection of Pb²⁺.

Keywords

Electrochemical sensor / Lead / Nitrogen-doped graphene / Au@SiO₂@Fe₃O₄ / L-Cysteine

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Jing Nie, Bin He, Yanmei Cheng, Wei Yin, Changjun Hou, Danqun Huo, Linlin Qian, Yunan Qin, Huanbao Fa. Design of L-cysteine functionalized Au@SiO₂@Fe₃O₄/nitrogen-doped graphene nanocomposite and its application in electrochemical detection of Pb²⁺. Chemical Research in Chinese Universities, 2017, 33(6): 951-957 DOI:10.1007/s40242-017-7101-2

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