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Identification of individual and few layers of WS2 using Raman Spectroscopy
Open accessAbstract
The Raman scattering of single- and few-layered WS 2 is studied as a function of the number of S-W-S layers and the excitation wavelength in the visible range (488, 514 and 647 nm). For the three excitation wavelengths used in this study, the frequency of the A 1g (Γ) phonon mode monotonically decreases with the number of layers. For single-layer WS 2 , the 514.5 nm laser excitation generates a second-order Raman resonance involving the longitudinal acoustic mode (LA(M)). This resonance results from a coupling between the electronic band structure and lattice vibrations. First-principles calculations were used to determine the electronic and phonon band structures of single-layer and bulk WS 2. The reduced intensity of the 2LA mode was then computed, as a function of the laser wavelength, from the fourth-order Fermi golden rule. Our observations establish an unambiguous and nondestructive Raman fingerprint for identifying single- and few-layered WS 2 films.
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Geim, A. K., & Novoselov, K. S. (2007) · Nature Materials · doi:10.1038/nmat1849 · Cited by 39,979
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Self-citationShi, J., Ma, D., Han, G.-F., Zhang, Y., Ji, Q., Gao, T., Sun, J., Song, X., Li, C., Zhang, Y., et al. (2014) · ACS Nano · doi:10.1021/nn503211t · Cited by 459
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Metadata
- Authors
- Berkdemir, A., Gutiérrez, H. R., Botello-Méndez, A. R., Perea-López, N., Elías, A. L., Chia, C.-I., Wang, B., Crespi, V. H., López-Urías, F., Charlier, J.-C., Terrones, H., & Terrones, M.
- Venue
- Scientific Reports
- Published
- 2013-04-30
- Volume
- 3
- Issue
- 1
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2042685082
- Cited by
- 1,599
- References
- 1
- FWCI
- 41.00
- Type
- journal article
- Language
- en
- Open access
- gold
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- Berkdemir, A., Gutiérrez, H. R., Botello-Méndez, A. R., Perea-López, N., Elías, A. L., Chia, C.-I., Wang, B., Crespi, V. H., López-Urías, F., Charlier, J.-C., Terrones, H., & Terrones, M. (2013). Identification of individual and few layers of WS2 using Raman Spectroscopy. Scientific Reports. https://doi.org/10.1038/srep01755
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