Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 27: Nano tubes and fibres
CPP 27.3: Talk
Tuesday, March 8, 2005, 14:30–14:45, TU C243
UV Raman measurements of very small nanotubes grown in zeolite — •María Machón1, Janina Maultzsch1, Pascal Puech2, Stephanie Reich3 und Christian Thomsen1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany — 2Laboratoire Physique des Solides de Toulouse UMR-CNRS 5477, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse, France — 3Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, United Kingdom
We present a UV resonant Raman study of the smallest single-walled nanotubes, grown in the channels of zeolite crystals. The size of the zeolite channels limits the diameter of the nanotubes and its shape forces their alignment, both exceptional characteristics for nanotube samples. The Raman spectrum presents great differences with that of bigger nanotubes. They may be related to the extremely small diameter of the nanotubes or to the symmetry breaking due to the environment. We discuss our measurements in light of the double resonance theory. Particularly, the peak at ≈650 cm−1, resonant at an energy of about 3.4 eV suggests the presence of smaller nanotubes than supposed up to now, i.e., with a diameter under 4 Å.