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    A new route to produce efficient surface-enhanced Raman spectroscopy substrates: Gold-decorated CdSe nanowires

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    Type
    Article
    Authors
    Das, Gobind cc
    Chakraborty, Ritun
    Gopalakrishnan, Anisha
    Baranov, Dmitry
    Di Fabrizio, Enzo M. cc
    Krahne, Roman
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2013-04-13
    Online Publication Date
    2013-04-13
    Print Publication Date
    2013-05
    Permanent link to this record
    http://hdl.handle.net/10754/562721
    
    Metadata
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    Abstract
    Surface-enhanced Raman spectroscopy is a popular tool for the detection of extremely small quantities of target molecules. Au nanoparticles have been very successful in this respect due to local enhancement of the light intensity caused by their plasmon resonance. Furthermore, Au nanoparticles are biocompatible, and target substances can be easily attached to their surface. Here, we demonstrate that Au-decorated CdSe nanowires when employed as SERS substrates lead to an enhancement as large as 105 with respect to the flat Au surfaces. In the case of hybrid metal-CdSe nanowires, the Au nucleates preferably on lattice defects at the lateral facets of the nanowires, which leads to a homogeneous distribution of Au nanoparticles on the nanowire, and to an efficient quenching of the nanowire luminescence. Moreover, the size of the Au nanoparticles can be well controlled via the AuCl3 concentration in the fabrication process. We demonstrate the effectiveness of our SERS substrates with two target substances, namely, cresyl-violet and rhodamine-6G. Au-decorated nanowires can be easily fabricated in large quantities at low cost by wet-chemical synthesis. Furthermore, their deposition onto various substrates, as well as the functionalization of these wires with the target substances, is as straightforward as with the traditional markers. © 2013 Springer Science+Business Media Dordrecht.
    Citation
    Das, G., Chakraborty, R., Gopalakrishnan, A., Baranov, D., Di Fabrizio, E., & Krahne, R. (2013). A new route to produce efficient surface-enhanced Raman spectroscopy substrates: gold-decorated CdSe nanowires. Journal of Nanoparticle Research, 15(5). doi:10.1007/s11051-013-1596-3
    Publisher
    Springer Nature
    Journal
    Journal of Nanoparticle Research
    DOI
    10.1007/s11051-013-1596-3
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11051-013-1596-3
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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