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Chemical Research in Chinese Universities

, Volume 33, Issue 6, pp 951–957 | Cite as

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
Article

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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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Jing Nie
    • 1
  • Bin He
    • 1
  • Yanmei Cheng
    • 1
  • Wei Yin
    • 1
  • Changjun Hou
    • 2
  • Danqun Huo
    • 2
  • Linlin Qian
    • 1
  • Yunan Qin
    • 1
  • Huanbao Fa
    • 1
  1. 1.National-municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, College of Chemistry and Chemical EngineeringChongqing UniversityChongqingP. R. China
  2. 2.Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of BioengineeringChongqing UniversityChongqingP. R. China

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