Raman spectroscopy study of carbon nanotube peapods excited by near-IR laser under high pressure
2007 (Swedish)In: Physical Review B, ISSN 0163-1829, Vol. 76, no 19, 195417- p.Article in journal (Refereed) Published
A resonant Raman spectroscopy study has been carried out under high pressure, using a diamond anvil cell,
on carbon nanotube peapods (C60@SWNT) synthesized in high yield in our laboratory. The Raman signal was
excited by a near IR laser (830 nm) to avoid photopolymerization of C60 and thus obtain the intrinsic vibrational
information on the C60 molecules in the nanotubes. It is found that the surrounding tubes create an
effective pressure on the encapsulated C60 due to tube-fullerene interactions, resulting in a shift of the intrinsic
Ag(2) vibrational mode to 1474 cm−1 at ambient pressure. High pressure Raman spectroscopy indicates that
(C60)2 dimers form near 1 GPa, and that a further polymerization of C60 occurs near 23 GPa, creating linear
chains of covalently linked C60 molecules in the tubes.
Place, publisher, year, edition, pages
2007. Vol. 76, no 19, 195417- p.
C60, peapods, C60@SWNT, carbon nanotube, high pressure, Raman scattering, IR excitation, dimer, polymer, linear chain
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:umu:diva-17934DOI: 10.1103/PhysRevB.76.195417OAI: oai:DiVA.org:umu-17934DiVA: diva2:157607
Selected for Virtual Journal of Nanoscale Science and Technology, volume 16, issue 22, 26th November 2007.2007-11-272007-11-272015-09-28Bibliographically approved