Thermal expansion of single-walled carbon nanotube (SWNT) bundles: X-ray diffraction studies

Thermal expansion coefficient in single-walled carbon nanotube bundles was determined as (－0.15±0.20)×10^<－5> (1/K) for the tube diameter and (0.75±0.25)×10^<－5> (1/K) for the triangular lattice constant by means of x-ray scattering between 300 K to 950 K. The value for the intertube gap was (4.2±1.4) ×10^<－5> (1/K), which is larger than 2.6×10^<－5> (1/K) for the c-axis thermal expansion in graphite. The results reveal the presence of a remarkably larger lattice anharmonicity in nanotube bundles than that of graphite. The small value for the tube diameter is consistent with the seamless tube structure formed by a strong covalent bond between carbon atoms comparable to that in graphite.
identifier:10980121
identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/3359