Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Single Molecules
CPP 15.4: Vortrag
Dienstag, 26. Februar 2008, 17:45–18:00, C 230
Time-resolved photoluminescence studies on individual single carbon nanotubes — •Tobias Gokus1, Hayk Harutyunyan1, Frank Hennrich2, Manfred Kappes2, and Achim Hartschuh1 — 1Department Chemie und Biochemie, Ludwig-Maximilians-Universität München and CeNS, D-81377 München — 2Forschungszentrum Karlsruhe, Institut für Nanotechnologie, D-76021 Karlsruhe
The photoluminescence lifetime of individual semiconducting single-walled carbon nanotubes (SWCNTs) dispersed on glass substrates has been measured using time correlated single photon counting (TCSPC) at room temperature. We observe mono-exponential decay dynamics of the exciton recombination over more than four orders of magnitude in agreement with previous measurements at low temperature [1]. All photoluminescence transients show fast decay times in the range of few picoseconds (~10 ps) with large variations from nanotube to nanotube of the same chirality (n,m). To clarify the origin of these lifetime variations we studied the effects of finite tube-length, excitation energy and nanotube environment for different nanotube chiralities.
[1] A. Hagen et al., Phys. Rev. Lett. 95, 197401 (2005).