Surface‐enhanced Raman spectra on graphene

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EarlyView Article

  • Published: Aug 29, 2017
  • Author: Johan Ek Weis, Jana Vejpravova, Tim Verhagen, Zuzana Melnikova, Sara Costa, Martin Kalbac
  • Journal: Journal of Raman Spectroscopy

Surface‐enhanced Raman spectroscopy is a valuable tool for inspection of trace concentrations of various molecules; hence, this method has a great potential for characterization of functionalised graphene. However, to make this method a reliable analytical tool, the influence of the metal–graphene interactions on Raman spectra of the graphene must be understood. Here, the surface‐enhanced Raman spectra of exfoliated single‐layer graphene covered with gold or silver thin layers were studied. The metal–graphene interactions resulted in the broadening of the G mode and the 2D mode of graphene. A change of the 2D mode dispersion was also observed. The effects were found to be weaker for the silver layer; however, the Raman signal enhancement of the graphene features was found to be significantly stronger in case of the silver layer. Various scenarios of the observed effects are discussed: graphene–plasmon interaction, charge transfer between the metal and graphene, and selective enhancement at the lattice and topographic defects. Copyright © 2017 John Wiley & Sons, Ltd.

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