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Au concentration-dependent quenching of Raman 2D peak in graphene
P. Ranjan, Tulika, R. Laha,
Published in John Wiley and Sons Ltd
Volume: 48
Issue: 4
Pages: 586 - 591
We investigate the effect of sputtered gold nanoclusters (AuNCs) on the Raman spectra of graphene. The two prominent Raman peaks of graphene – 2D and G – show drastically different behaviour with AuNC introduction. The Raman 2D peak intensity decreases with gold coverage and finally is quenched for moderate gold nanoparticle coverage, while the G peak shows a AuNC size-dependent enhancement in peak intensity. The quenching of the 2D peak is attributed to the hybridization of graphene's 2pz orbital with the 5d orbitals of Au. The G peak enhancement is due to the surface-enhanced Raman scattering induced by the surface plasmons created in the AuNC by the incident laser beam (He–Ne laser, wavelength = 632.8 nm). The existence of surface plasmons is independently confirmed by UV-visible spectrophotometry measurements. Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.
About the journal
JournalData powered by TypesetJournal of Raman Spectroscopy
PublisherData powered by TypesetJohn Wiley and Sons Ltd