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Photoluminescence microscopy of carbon nanotubes grown by chemical vapor deposition: Influence of external dielectric screening on optical transition energies

Kiowski, Oliver; Lebedkin, Sergei; Hennrich, Frank; Malik, Sharali; Rösner, Harald; Arnold, Katharina; Sürgers, Christoph; Kappes, Manfred M.

Abstract: Photoluminescence (PL) laser microscopy was applied to determine optical transition energies E-11 and E-22 of individual semiconducting single-walled carbon nanotubes (SWNTs) suspended on top of carbon nanotube "forests," grown by chemical vapor deposition (CVD) on silicon substrates. A uniform increase of E-11 and E-22 energies by 40-55 and 24-48 meV, respectively, was found for 19 different (n,m) nanotube species suspended in air or a vacuum-relative to SWNTs in a reference water-surfactant dispersion. CVD-grown SWNTs embedded in paraffin oil and 1-methylnaphthalene show nearly the same PL peak positions as SWNTs in aqueous dispersion, indicating similar dielectric screening of excitons in SWNTs in these media.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2007
Sprache Englisch
Identifikator DOI: 10.1103/PhysRevB.75.075421
ISSN: 1098-0121
KITopen ID: 1000050513
HGF-Programm 43.02.02; LK 01
Erschienen in Physical Review B - Condensed Matter and Materials Physics
Band 75
Heft 7
Seiten 075421/1-7
URLs Volltext(Suppl.Material)_(für_Abonnenten)
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