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Title: Raman spectra and thermal stability analysis of 0.4 nm freestanding single-walled carbon nanotubes
Authors: Tang, Zi-Kang
Ye, J. T.
Keywords: Carbon nanotubes
Raman spectra
Thermal stability
Heat treatment
Issue Date: Jul-2005
Citation: Physical review. B, v. 72, no. 4, July 2005, p. 045414
Abstract: Thermal stability of ultra-small 0.4 nm single-walled carbon nanotubes are studied by means of Raman scattering measurement under vacuum. The 0.4 nm SWNTs are very stable when they are confined inside the channels of the AFI crystal. When these SWNTs are extracted from the channels into free space, however, they become thermally unstable because of the strong curvature effect. The in situ Raman scattering measurement under 1 x 10 -5 mbar shows, among the three structures of the 0.4 nm-sized SWNTs, the (5,0) tube is slightly stabler than the other two structures: the (3,3) and (4,2) tubes. The (5,0) tube can survive until temperature reaches 790 K, while the (3,3) and (4,2) tubes are collapsed into amorphous structure at 730 K, much lower than that of large-sized SWNTs. Reference measurement under UHV condition confirmed that the 0.4 nm SWNTs are destroyed after the same thermal treatment.
Rights: Phys. Rev. B © 2005 American Physical Society. The Journal's web site is located at
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