The photoinduced charge transfer mechanism in aligned and unaligned carbon nanotubes

Gianluca Galimberti, Stefania Pagliara*, Stefano Ponzoni, Stefano Dal Conte, Federico Cilento, Gabriele Ferrini, Stephan Hofmann, Muhammad Arshad, Cinzia Cepek, Fulvio Parmigiani

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

11 Citaten (Scopus)

Samenvatting

Using time-resolved reflectivity measurements on unaligned and aligned bundled single-wall carbon nanotubes with a pump energy of 1.55 eV, quasi-resonant with the second Van Hoye singularity of semiconducting tubes, a positive sign of the transient reflectivity is detected in unaligned nanotubes. In contrast a negative sign is detected in aligned nanotubes. This discovery addresses a long-standing question showing that in unaligned nanotubes the stronger intertube interactions favor the formation of short-lived free charge carriers in semiconducting tubes. A detailed analysis of the transient reflectivity spectral response shows that the free carriers in the photo-excited state of semiconducting tubes move towards metallic tubes in about 400 fs. (C) 2011 Elsevier Ltd. All rights reserved.

Originele taal-2English
Pagina's (van-tot)5246-5252
Aantal pagina's7
TijdschriftCarbon
Volume49
Nummer van het tijdschrift15
DOI's
StatusPublished - dec-2011

Citeer dit