| Raman spectroscopy study of carbon nanotube peapods excited by near-IR laser under high pressure (2007) | |||||||||||
Abstract | |||||||||||
| A resonant Raman spectroscopy study has been carried out under high pressure, using a diamond anvil cell, on carbon nanotube peapods (C-60@SWNT) synthesized in high yield in our laboratory. The Raman signal was excited by a near IR laser (830 nm) to avoid photopolymerization of C-60 and thus obtain the intrinsic vibrational information on the C-60 molecules in the nanotubes. It is found that the surrounding tubes create an effective pressure on the encapsulated C-60 due to tube-fullerene interactions, resulting in a shift of the intrinsic A(g)(2) vibrational mode to 1474 cm(-1) at ambient pressure. High pressure Raman spectroscopy indicates that (C-60)(2) dimers form near 1 GPa, and that a further polymerization of C-60 occurs near 23 GPa, creating linear chains of covalently linked C-60 molecules in the tubes. | |||||||||||
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