Anharmonic properties of raman modes in double wall carbon nanotubes
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| Format: | Artículo científico |
| Langue: | en |
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Sociedad Mexicana de Física A.C.
2011
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| _version_ | 1876482936313741312 |
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| author | J. Marquina |
| author_facet | J. Marquina |
| contents | Anharmonic properties of raman modes in double wall carbon nanotubes J. Marquina CH. Power J.M. Broto E. Flahaut J. Gonzalez Física, Astronomía y Matemáticas high temperature anharmonicity Raman spectroscopy Grüneisen parameter The temperature dependence of the radial breathing modes (RBMs) and the zone-center tangential optical phonons (G-bands) of doublewalled carbon nanotubes (DWCNTs) has been investigated between 300 and 700 K using Raman scattering. As expected, with increasing temperature, the frequencies of the Raman peaks, including the RBMs and G-bands downshift simultaneously. We show here that the temperature dependence of the RBMs can be fitted by a simple linear dependence and different RBMs have different frequency shifts. We observe a noticeable nonlinearity in the temperature dependence of the G-band associated with the outer semiconducting tube G+ ext (s). The deviation from the linear trend is due to the contribution of the third-order anharmonic term in the lattice potential energy with a pure temperature effect. An estimated value of 1.5 for the Gr¨uneisen parameter of the G+ ext (s) band was found. 2011 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57021213007 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.6 Vol.57 |
| format | Artículo científico |
| id | redalyc_57021213007 |
| institution | Redalyc |
| language | en |
| publishDate | 2011 |
| publisher | Sociedad Mexicana de Física A.C. |
| spellingShingle | Anharmonic properties of raman modes in double wall carbon nanotubes J. Marquina Física, Astronomía y Matemáticas high temperature anharmonicity Raman spectroscopy Grüneisen parameter Anharmonic properties of raman modes in double wall carbon nanotubes J. Marquina CH. Power J.M. Broto E. Flahaut J. Gonzalez Física, Astronomía y Matemáticas high temperature anharmonicity Raman spectroscopy Grüneisen parameter The temperature dependence of the radial breathing modes (RBMs) and the zone-center tangential optical phonons (G-bands) of doublewalled carbon nanotubes (DWCNTs) has been investigated between 300 and 700 K using Raman scattering. As expected, with increasing temperature, the frequencies of the Raman peaks, including the RBMs and G-bands downshift simultaneously. We show here that the temperature dependence of the RBMs can be fitted by a simple linear dependence and different RBMs have different frequency shifts. We observe a noticeable nonlinearity in the temperature dependence of the G-band associated with the outer semiconducting tube G+ ext (s). The deviation from the linear trend is due to the contribution of the third-order anharmonic term in the lattice potential energy with a pure temperature effect. An estimated value of 1.5 for the Gr¨uneisen parameter of the G+ ext (s) band was found. 2011 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57021213007 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.6 Vol.57 |
| title | Anharmonic properties of raman modes in double wall carbon nanotubes |
| topic | Física, Astronomía y Matemáticas high temperature anharmonicity Raman spectroscopy Grüneisen parameter |
| url | https://www.redalyc.org/articulo.oa?id=57021213007 |