Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 51, Pages 20131-20134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp809501e
Keywords
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Funding
- NSF [DMR-0348585, CCF-0506660]
- U.S. Department of Energy
- Division of Materials Sciences [DE-FG02-07ER46459]
- University of Illinois at Urbana-Champaign
- U.S. Department of Energy (DOE) [DE-FG02-07ER46459] Funding Source: U.S. Department of Energy (DOE)
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Environment-induced effects on the E-2G G-band and A(1)' 2D-band Raman spectral features of single-layer graphene provide insights on the intrinsic and extrinsic dependences of the phonon energy and line width on temperature. Graphene prepared via mechanical exfoliation in air exhibits a G-band line width that increases with temperature between 298 and 573 K but shows an opposite trend after annealing under Ar. The opposing temperature dependences are considered within the context of Kohn anomaly induced phonon softening and broadening. The primary cause of the changes in the E2G phonon energy and the electron-phonon coupling is attributed to ambient O-2 shifting the Fermi level away from the Dirac point. Our results emphasize the need to carefully consider the sample environment when investigating electronic and vibrational properties of graphene.
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