Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 32: C/diamond
HL 32.2: Talk
Wednesday, March 28, 2007, 16:45–17:00, H14
Pressure-induced phenomena in single-walled carbon nanotubes — •K. Thirunavukkuarasu1, C.A. Kuntscher1, Á. Pekker2, K. Kamarás2, F. Hennrich3, M. Kappes3,4, and Y. Iwasa5 — 1Experimentalphysik II, Universität Augsburg, D-86159 Augsburg, Germany — 2Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O.Box 49, Budapest, Hungary H 1525 — 3Institut für Nanotechnologie, Forschungzentrum Karlsruhe, D-76021 Karlsruhe, Germany — 4Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 5Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
The study of single-walled carbon nanotubes (SWNTs) under high pressure has attracted much interest recently as the application of pressure induces structural deformations of the SWNTs and also tunes the intertube interactions by changing the distances between the tubes. Both should significantly affect the properties of the SWNTs.
We studied the optical response of thin films of both unoriented and oriented SWNTs over a broad frequency range (IR-VIS) and for pressures up to 8 GPa. The effect of pressure on oriented nanotubes caused major changes in the optical properties only for the polarization along the nanotube axis. We will discuss in detail the effect of pressure on the electronic properties like interband transitions for the different SWNT films.
Supported by the DFG, Emmy Noether-program. Provision of beamtime at the ANKA Angströmquelle Karlsruhe is acknowledged.