SERS efficiencies of micrometric polystyrene beads coated with gold and silver nanoparticles: The effect of nanoparticle size

Bernat Mir-Simon, Judit Morla-Folch, Patricia Gisbert-Quilis, Nicolas Pazos-Perez, Hai Nan Xie, Neus G. Bastús, Víctor Puntes, Ramon A. Alvarez-Puebla, Luca Guerrini

    Research output: Contribution to journalArticleResearchpeer-review

    26 Citations (Scopus)

    Abstract

    © 2015 IOP Publishing Ltd. Rapid advances in nanofabrication techniques of reproducibly manufacturing plasmonic substrates with well-defined nanometric scale features and very large electromagnetic enhancements paved the way for the final translation of the analytical potential of surface-enhanced Raman scattering (SERS) to real applications. A vast number of different SERS substrates have been reported in the literature. Among others, discrete particles consisting of an inorganic micrometric or sub-micrometric core homogeneously coated with plasmonic nanoparticles stand out for their ease of fabrication, excellent SERS enhancing properties, long-term optical stability and remarkable experimental flexibility (manipulation, storage etc). In this article, we performed a systematic experimental study of the correlation between the size of quasi-spherical gold and silver nanoparticle and the final optical property of their corresponding assembles onto micrometric polystyrene (PS) beads. The size and composition of nanoparticles play a key role in tuning the SERS efficiency of the hybrid material at a given excitation wavelength. This study provides valuable information for the selection and optimization of the appropriate PS@NPs substrates for the desired applications.
    Original languageEnglish
    Article number114012
    JournalJournal of Optics (United Kingdom)
    Volume17
    Issue number11
    DOIs
    Publication statusPublished - 23 Oct 2015

    Keywords

    • nanoparticles
    • plasmonic
    • polystyrene microparticles
    • surface-enhanced Raman scattering

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