Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 24: Nano structured materials II
MM 24.2: Vortrag
Mittwoch, 28. März 2007, 17:00–17:15, H4
Radial distribution function as a tool to analyse nanotubes chiralities — •Pedro Ojeda1, Mauricio Terrones2, Humberto Terrones2, Darin Hoffman3, Thomas Proffen3, Anthony Cheetham4, and Martin Garcia1 — 1Theoretische Physik FB 18, Universitaet Kassel — 2Advenced Materials Department, IPICyT, SLP, Mexico — 3Manuel Lujan Jr. Neutron Scattering Center, Los Alamos, NM 87545, USA — 4Materials Research Laboratory, University of California, Santa Barbara, CA 93106-5121, USA
The radial distribution function (RDF) of different single walled carbon nanotubes (SWCNTs) has been calculated showing characteristic patterns. Features related to diameter, chirality and doping in these nanostructures are analyzed. We also investigate the induced chirality of two samples, prepared with the chemical vapor deposition (CVD) method and the high pressure Co conversion (HIPCo) procedure, respectively, by comparing the experimental RDF signal obtained from the neutron scattering technique with the RDFs of our simulations. We found armchair and zigzag nanotubes in the sample, but we cannot discard the presence of other chiralities. We believe that this is a useful method to study chiralities induced by different methods of production. Data up to Q= 30 Å−1 were used in the Fourier transform, giving a high real space resolution of Δ r ∼ 0.2 Å.