High-Pressure Raman Study of Debundled Single-Walled Carbon Nanotubes
We report the pressure dependence for the radial (ω
R) and tangential (ω
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 ω
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 (ω
R) and tangential (ω
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.
Keywords: DEBUNDLED SWNTS; RAMAN SPECTROSCOPY; SINGLE-WALLED CARBON NANOTUBES
Document Type: Research Article
Affiliations: 1: Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany 2: Department of Physics, Oakland University, Rochester, Michigan, USA 3: Department of Physics & Astronomy, University of Kentucky, Lexington, Kentucky, USA 4: Zyvex Corporation, Richardson, Texas, USA 5: Department of Chemistry, University of California, Riverside, California, USA 6: Department of Physics, Pennsylvania State University, University Park, Pennsylvania, USA 7: Department of Physics and Astronomy, Clemson University, Clemson, South Carolina, USA
Publication date: 01 February 2003
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