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Pressure dependence of Raman modes in double wall carbon nanotubes filled with α-Fe

Gonzalez, Jesus and Power, Chrystian and Belandria, Edgar and Jorge, Jose and Gonzalez-Jimenez, Fernando and Millot, Marius and Nanot, S. and Broto, Jean-Marc and Flahaut, Emmanuel Pressure dependence of Raman modes in double wall carbon nanotubes filled with α-Fe. (2008) High Pressure Research, vol. 28 (n° 4). pp. 577-582. ISSN 0895-7959

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Official URL: http://dx.doi.org/10.1080/08957950802485757

Abstract

The preparation of highly anisotropic one-dimensional (1D) structures confined into carbon nanotubes (CNTs) in general is a key objective in CNTs research. In this work, the capillary effect was used to fill double wall carbon nanotubes with iron. The samples are characterized by Mössbauer and Raman spectroscopy, transmission electron microscopy, scanning area electron diffraction, and magnetization. In order to investigate their structural stability and compare it with that of single wall carbon nanotubes (SWNTs), elucidating the differences induced by the inner-outer tube interaction, unpolarized Raman spectra of tangential modes of double wall carbon nanotubes (DWNTs) filled with 1D nanocrystallin α-Fe excited with 514 nm were studied at room temperature and elevated pressure. Up to 16 GPa we find a pressure coefficient for the internal tube of 4.3 cm−1 GPa−1 and for the external tube of 5.5 cm−1 GPa−1. In addition, the tangential band of the external and internal tubes broadens and decreases in amplitude. All findings lead to the conclusion that the outer tube acts as a protection shield for the inner tubes (at least up 16 GPa). Structural phase transitions were not observed in this range of pressure.

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. The definitive version is available at http://www.taylorandfrancis.com/ The original PDF of the article can be found at High Pressure Research website : http://www.informaworld.com/smpp/content~db=all?content=10.1080/08957950802485757
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Other partners > Universidad de Los Andes (VENEZUELA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Universidad de Cantabria - UNICAN (SPAIN)
Other partners > Universidad Central de Venezuela (VENEZUELA)
Laboratory name:
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Deposited By: Nihad Lahdifi

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