title: High-pressure Raman study of debundled single-walled carbon nanotubes.
abstract: We report the pressure dependence for the radial (omega R) and tangential (omega T) band frequencies in debundled single-walled carbon nanotubes (SWNTs) derived from laser-synthesized SWNT bundles. As previously described, a chemical procedure was used to prepare debundled SWNTs from as-prepared, large SWNT bundles. The normalized pressure coefficient for omega R in the debundled sample was compared with the corresponding value in the bundled sample to quantify the strength of van der Waals interactions between tubes in these nanotube materials. Furthermore, the pressure dependences for the radial (omega R) and tangential (omega T) band frequencies in debundled tubes were also compared with corresponding dependences predicted for isolated SWNTs, obtained with generalized tight binding molecular dynamic (GTBMD) simulations described in our previous work. The results presented here collectively suggest that the van der Waals interaction is still strong in the debundled sample studied here, which contained predominantly small bundles of SWNTs rather than isolated tubes.
authors.affiliation: Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Schlecht
authors.forename: U D
authors.initials: UD
authors.lastname: Venkateswaran
authors.forename: E
authors.initials: E
authors.lastname: Richter
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: R C
authors.initials: RC
authors.lastname: Haddon
authors.forename: P C
authors.initials: PC
authors.lastname: Eklund
authors.forename: A M
authors.initials: AM
authors.lastname: Rao
mesh_terms: D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000145:classification* / Q000302:isolation & purification; D011312:Pressure; D012666:Semiconductors; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: D008670:Metals; D037742:Nanotubes, Carbon