Effect of a liquid pressure‐transmitting medium on the high pressure behavior of open‐ and closed‐end single‐walled carbon nanotubes and of C₆₀‐peapods

Abstract

In situ synchrotron X-ray diffraction measurements of three types of single-walled carbon nanotubes (SWNTs) (open-and closed-end, and C 60 -peapod samples) under high pressure using a cubic anvil press with a liquid-pressure-transmitting-medium (LPTM) were carried out. Comparing with a previous experiment using a solid-pressure-transmitting-medium, it was found that the high pressure behavior of SWNT bundles is much affected by the LPTM. In order to investigate the dependence of the LPTM effect on the tube-end structure, in situ Raman scattering measurements were also performed.

Comparative high pressure Raman study of individual and bundled single‐wall carbon nanotubes

“…The similarity in the pressure slopes of the i-and b-SWCNT RBMs denotes that even in the case of bundle penetration by the PTM used in our study, the PTM-nanotube interaction does not significantly affect the pressure response of the tubes in b-SWCNTs in contrast to that suggested by Amer et al [12]. Moreover, our experimental findings are compatible with the high pressure investigation of openand closed-end bundled SWCNTs up to 5 GPa [13]. In that case, the pressure dependence of the RBM and G band frequencies is identical for both materials, although X-ray diffraction measurements indicate the stability of open b-SWCNTs and the deformation of the closed-end tubes above 1.7 GPa.…”

Raman spectroscopy of open‐ended Single Wall Carbon Nanotubes under pressure: effect of the pressure transmitting medium

“…Several theoretical works have predicted that phase transitions should occur under pressure [1][2][3][4][5][6] implying a change of the tube cross section. Many experiments under pressure have also been performed: X-ray diffraction [7][8][9][10], neutron diffraction [11], resistivity [12][13][14][15] and Raman spectroscopy [16][17][18][19][20][21][22][23][24]. In some cases, signs of phase transitions are observed around 3 GPa, in others [8,20] no phase transition is observed up to 10 GPa and in our previous work [16] we have not observed phase transformations up to 40 GPa.…”

Pressure-polymerization of C60 molecules in a carbon nanotube

“…Similar polymerization of carbon nanotubes (CNTs) is expected and many high pressure experiments of CNTs have been performed [10][11][12]. However, the detailed structural property of CNTs is still not well understood.…”