Journal ArticleDOI
Compressibility and Polygonization of Single-Walled Carbon Nanotubes under Hydrostatic Pressure
Jie Tang,Lu Chang Qin,Taizo Sasaki,Masako Yudasaka,Akiyuki Matsushita,Sumio Iijima,Sumio Iijima +6 more
TLDR
Theoretical calculations suggest that single-walled carbon nanotubes are polygonized when they form bundles of hexagonal close-packed structure and the intertubular gap is smaller than the equilibrium spacing of graphite.Abstract:
Single-walled carbon nanotubes show linear elasticity under hydrostatic pressure up to 1.5 GPa at room temperature. The volume compressibility, measured by in situ synchrotron x-ray diffraction, has been determined to be $0.024\mathrm{GPa}{}^{\ensuremath{-}1}$. Theoretical calculations suggest that single-walled carbon nanotubes are polygonized when they form bundles of hexagonal close-packed structure and the intertubular gap is smaller than the equilibrium spacing of graphite (002) $(d\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3.35\phantom{\rule{0ex}{0ex}}\AA{})$. It has also been determined that the deformation of the trigonal nanotube lattice under hydrostatic pressure is reversible up to 4 GPa, beyond which the nanotube lattice is destroyed.read more
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Journal ArticleDOI
Structural changes in single-walled carbon nanotubes under non-hydrostatic pressures: x-ray and Raman studies
S. Karmakar,Surinder M. Sharma,Pallavi V. Teredesai,D. V. S. Muthu,A. Govindaraj,S. K. Sikka,A. K. Sood,A. K. Sood +7 more
TL;DR: In this paper, the behavior of single-walled carbon nanotubes bundles under non-hydrostatic pressure was investigated using in situ x-ray diffraction and Raman scattering techniques, and the diffraction line corresponding to the two-dimensional triangular lattice in the bundles is not reversible for pressures beyond 5 GPa.
Journal ArticleDOI
Infrared spectroscopic studies on unoriented single-walled carbon nanotube films under hydrostatic pressure
TL;DR: In this article, the electronic properties of as-prepared and purified unoriented single-walled carbon nanotube films were studied by transmission measurements over a broad frequency range (far-infrared up to visible) as a function of temperature (15 K - 295 K) and external pressure (up to 8 GPa).
Journal ArticleDOI
Revealing properties of single-walled carbon nanotubes under high pressure
Jie Tang,Lu Chang Qin,Taizo Sasaki,Masako Yudasaka,Akiyuki Matsushita,Sumio Iijima,Sumio Iijima +6 more
TL;DR: In this article, it was found by the x-ray diffraction experiment under hydrostatic pressure that the carbon nanotubes are compressed easily with a high volume compressibility of 0.024 GPa−1.
Journal ArticleDOI
Fracture resistance of zigzag single walled carbon nanotubes
Qiang Lu,Baidurya Bhattacharya +1 more
TL;DR: In this article, the fracture resistance of zigzag SWNTs with preexisting defects is calculated using fracture mechanics concepts based on atomistic simulations; the interatomic forces are modelled with a modified Morse potential; the Anderson thermostat is used for temperature control.
Journal ArticleDOI
Polygonization and anomalous graphene interlayer spacing of multi-walled carbon nanofibers
TL;DR: In this paper, the structural properties of carbon nanotubes were investigated using a multiscale approach rooted in extensive first-principles calculations, specifically allowing the nanotube cross-sections to polygonize.