Raman spectroscopy study of carbon nanotube peapods excited by near-IR laser under high pressure

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Yonggang Zou, Bingbing Liu, Mingguang Yao, Yuanyuan Hou, Lin Wang, Shidan Yu, Peng Wang, Bing Li, Bo Zou, Tian Cui, and Guangtian Zou
State Key Laboratory of Superhard Materials (Jilin University), Changchun 130012, People's Republic of China

T. Wågberg and B. Sundqvist
Department of Physics, Umeå University, S-90187 Umeå, Sweden

Received 13 February 2007; revised 28 May 2007; published 14 November 2007

Aresonant Raman spectroscopy study has been carried out under highpressure, using a diamond anvil cell, on carbon nanotube peapods(C₆₀@SWNT) synthesized in high yield in our laboratory. The Ramansignal was excited by a near IR laser (830 nm) toavoid photopolymerization of C₆₀ and thus obtain the intrinsic vibrationalinformation on the C₆₀ molecules in the nanotubes. It isfound that the surrounding tubes create an effective pressure onthe encapsulated C₆₀ due to tube-fullerene interactions, resulting in ashift of the intrinsic A_g(2) vibrational mode to 1474 cm⁻¹ atambient pressure. High pressure Raman spectroscopy indicates that (C₆₀)₂ dimersform near 1 GPa, and that a further polymerization of C₆₀occurs near 23 GPa, creating linear chains of covalently linked C₆₀molecules in the tubes.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.195417
DOI:	10.1103/PhysRevB.76.195417
PACS:	61.46.Fg; 61.48.+c; 62.50.+p; 78.30.-j 61.46.Fg Nanotubes 61.48.+c Structure of fullerenes and fullerene-related materials 62.50.+p High-pressure and shock wave effects in solids and liquids 78.30.-j Infrared and Raman spectra (condensed matter) YEAR: 2007
KEYWORDS:	carbon nanotubes, fullerenes, high-pressure effects, infrared spectra, laser materials processing, polymerisation, Raman spectra, vibrational modes

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