C_<70> Molecular Stumbling inside Single-Walled Carbon Nanotubes

概要

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We report the structural study of C_<70>-one-dimensional (1D) crystal formed inside single-walled carbon nanotubes (SWNTs). X-ray diffraction measurements were performed between 100 K and 999 K on C_<70>-encapsulated SWNTs with an average diameter of 1.37 nm. Two different domains, where the dominant alignment of C_<70> molecular long axis is standing or lying with respect to the tube axis, were observed; the ratio of the standing to the lying C_<70>-domains is roughly 7:3. Thermal expansion of interfullerene distance gave no evidence for orientational phase transitions, not as in the 3D crystals. Instead, the long-range order of the standing C_<70>-alignment was thermally destroyed with an activation energy of 39±4 meV. The results imply the importance of either the 1D fluctuation or the tube-C_<70> interaction at finite temperatures.
社団法人日本物理学会の論文
2003-01-15