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Issue 22, 2014
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Plasmonic-enhanced Raman scattering of graphene on growth substrates and its application in SERS

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Abstract

We detail a facile method for enhancing the Raman signals of as-grown graphene on Cu foils by depositing gold nanoislands (Au Nis) onto the surface of graphene. It is found that an enhancement of up to 49 fold in the graphene Raman signal has been achieved by depositing a 4 nm thick Au film. The enhancement is considered to be related to the coupling between graphene and the plasmon modes of Au Nis, as confirmed by the finite element simulations. The plasmonic effect of the Au/graphene/Cu hybrid platform leads to a strong absorption at the resonant wavelength whose position shifts from visible light (640 nm) to near-infrared (1085 nm) when the thickness of Au films is increased from 2 nm to 18 nm. Finally, we demonstrate that hybrid substrates are reliable surface-enhanced Raman scattering (SERS) systems, showing an enhancement factor of ∼106 for dye molecules Rhodamine B and Rhodamine 6G with uniform and stable response and a detection limit of as low as 0.1 nM for Sudan III and Sudan IV.

Graphical abstract: Plasmonic-enhanced Raman scattering of graphene on growth substrates and its application in SERS

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Publication details

The article was received on 25 Jul 2014, accepted on 12 Sep 2014 and first published on 16 Sep 2014


Article type: Paper
DOI: 10.1039/C4NR04225E
Citation: Nanoscale, 2014,6, 13754-13760
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    Plasmonic-enhanced Raman scattering of graphene on growth substrates and its application in SERS

    Y. Zhao, G. Chen, Y. Du, J. Xu, S. Wu, Y. Qu and Y. Zhu, Nanoscale, 2014, 6, 13754
    DOI: 10.1039/C4NR04225E

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