Título

Identification of individual and few layers of WS2 using Raman Spectroscopy

Autor

ANDRES RAFAEL BOTELLO MENDEZ

NESTOR PEREA LOPEZ

ANA LAURA ELIAS ARRIAGA

Vincent Crespi

FLORENTINO LOPEZ URIAS

HUMBERTO TERRONES MALDONADO

MAURICIO TERRONES MALDONADO

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Identificador alterno

doi: https://dx.doi.org/10.1038%2Fsrep01755

Materias

INGENIERÍA Y TECNOLOGÍA - (CTI) CIENCIAS TECNOLÓGICAS - (CTI)

Resumen o descripción

"The Raman scattering of single-and few-layered WS2 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)(C) phonon mode monotonically decreases with the number of layers. For single-layer WS2, 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 WS2. 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 WS2 films."

Editor

Nature Publishing Group

Fecha de publicación

abril de 2013

Tipo de publicación

Artículo

Versión de la publicación

Versión publicada

Recurso de información

http://ipicyt.repositorioinstitucional.mx/jspui/handle/1010/1286

Formato

application/pdf

Idioma

Inglés

Audiencia

Público en general

Sugerencia de citación

Berkdemir, A. et al. Identification of individual and few layers of WS2 using Raman Spectroscopy. Sci. Rep. 3, 1755; DOI:10.1038/srep01755 (2013).

Repositorio Orígen

Repositorio IPICYT

Descargas

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