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Au concentration‐dependent quenching of Raman 2D peak in graphene
Author(s) -
Ranjan Pranay,
Laha Ranjit,
Balakrishnan Jayakumar
Publication year - 2017
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5075
Subject(s) - raman spectroscopy , graphene , raman scattering , nanoclusters , materials science , quenching (fluorescence) , plasmon , analytical chemistry (journal) , laser , molecular physics , chemistry , optics , nanotechnology , optoelectronics , fluorescence , physics , chromatography
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 2p z 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.