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    L-Cysteine-Modified Gold Nanostars for SERS-Based Copper Ions Detection in Aqueous Media

    Access Status
    Fulltext not available
    Authors
    Ndokoye, P.
    Ke, J.
    Liu, J.
    Zhao, Q.
    Li, Xin Yong
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Ndokoye, P. and Ke, J. and Liu, J. and Zhao, Q. and Li, X.Y. 2014. L-Cysteine-Modified Gold Nanostars for SERS-Based Copper Ions Detection in Aqueous Media. Langmuir. 30 (44): pp. 13491-13497.
    Source Title
    Langmuir
    DOI
    10.1021/la503553y
    ISSN
    0743-7463
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/34035
    Collection
    • Curtin Research Publications
    Abstract

    © 2014 American Chemical Society. Gold nanostars coated with cysteine (Cys-AuNSs) were successfully synthesized and used in SERS-based copper ions (Cu2+) detection in aqueous media. The strong coordination ability of cysteine (Cys) with Cu2+ and the resulting Cys-AuNSs-Cu complex formation led to AuNSs aggregation and the drastic change in intensity and strength of COOH band spectra. The aggregation of AuNSs yielded distinct SERS signals, which exhibited remarkable sensitivity and selectivity for Cu2+ over other metal ions. Using this SERS-based sensing method, we have achieved a practical detection limit of 10 µM. Such AuNSs-based detection could provide promising alternative choices for future SERS-active AuNSs application.

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