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Directed Self-Assembly of Gold Nanoparticles on Graphene-Ionic Liquid Hybrid for Enhancing Electrocatalytic Activity

Authors

  • Min Ho Yang,

    1. Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800
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  • Bong Gill Choi,

    1. Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800
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  • HoSeok Park,

    1. Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seochon-dong, Giheung-gu, Youngin-si, Gyeonggi-do 446-701, Korea
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  • Tae Jung Park,

    Corresponding author
    1. BioProcess Engineering Research Center, Center for Systems & Synthetic Biotechnology, and Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800)
    • BioProcess Engineering Research Center, Center for Systems & Synthetic Biotechnology, and Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800)
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  • Won Hi Hong,

    1. Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800
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  • Sang Yup Lee 

    Corresponding author
    1. Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800
    2. BioProcess Engineering Research Center, Center for Systems & Synthetic Biotechnology, and Institute for the BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800)
    3. Department of Bio & Brain Engineering, Department of Biological Sciences, and Bioinformatics Research Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea
    • Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea fax: +82-42-350-8800
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Abstract

The effects of introducing gold (Au) nanoparticles (NP) on the electrochemical properties of graphene functionalized with ionic liquid were investigated by cyclic voltammetry, amperometry, and AC impedance analysis. The introduction of Au NPs onto graphene-ionic liquid sheets led to enhanced electron transfer rate, low charge transfer resistance, and large electrocatalytic area. An electrochemical biosensor device based on the hybrid of Au NPs and functionalized graphenes was fabricated and found to have superior electrochemical performance in the detection of glucose, with a sensitivity of 0.16 µA mM−1, a detection limit of 0.13 mM, and a response time of 5 s.

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