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Probing the Intrinsic Properties of Exfoliated Graphene: Raman Spectroscopy of Free-Standing Monolayers
Open accessAbstract
The properties of pristine, free-standing graphene monolayers prepared by mechanical exfoliation of graphite are investigated. The graphene monolayers, suspended over open trenches, are examined by means of spatially resolved Raman spectroscopy of the G-, D-, and 2D-phonon modes. The G-mode phonons exhibit reduced energies (1580 cm(-1)) and increased widths (14 cm(-1)) compared to the response of graphene monolayers supported on the SiO(2)-covered substrate. From analysis of the G-mode Raman spectra, we deduce that the free-standing graphene monolayers are essentially undoped, with an upper bound of 2 x 10(11) cm(-2) for the residual carrier concentration. On the supported regions, significantly higher and spatially inhomogeneous doping is observed. The free-standing graphene monolayers show little local disorder, based on the very weak Raman D-mode response. The two-phonon 2D mode of the free-standing graphene monolayers is downshifted in frequency compared to that of the supported region of the samples and exhibits a narrowed, positively skewed line shape.
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Cited by
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Self-citationRaman spectroscopy of graphene-based materials and its applications in related devices
Wu, J.-B., Lin, M.-L., Cong, X., Liu, H.-N., & Tan, P.-H. (2018) · Chemical Society Reviews · doi:10.1039/c6cs00915h · Cited by 2,092
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Jones, R. R., Hooper, D. C., Zhang, L., Wolverson, D., & Valev, V. K. (2019) · Nanoscale Research Letters · doi:10.1186/s11671-019-3039-2 · Cited by 804
Atmospheric Oxygen Binding and Hole Doping in Deformed Graphene on a SiO2 Substrate
Ryu, S., Liu, L., Berciaud, S., Yu, Y.-J., Liu, H., Kim, P., Flynn, G. W., & Brus, L. E. (2010) · Nano Letters · doi:10.1021/nl1029607 · Cited by 784
Self-citationMicrowave synthesis of graphene sheets supporting metal nanocrystals in aqueous and organic media
Hassan, H. M. A., Abdelsayed, V., Khder, A. E. R. S., AbouZeid, K. M., Terner, J., El-Shall, M. S., Al-Resayes, S. I., & El-Azhary, A. A. (2009) · Journal of Materials Chemistry · doi:10.1039/b906253j · Cited by 548
Metadata
- Authors
- Berciaud, S., Ryu, S., Brus, L. E., & Heinz, T. F.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-01-14
- Volume
- 9
- Issue
- 1
- Pages
- 346-352
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2140444203
- Cited by
- 525
- References
- 0
- FWCI
- 11.62
- Type
- journal article
- Language
- en
- Open access
- green
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