Die u:cris Detailansicht:
Nonlinear optical properties of boron doped single-walled carbon nanotubes
- Autor(en)
- Benoy Anand, Ramakrishna Podila, Paola Ayala, Luciana Oliveira, Reji Philip, S. Siva Sankara Sai, Anvar A. Zakhidov, Apparao M. Rao
- Abstrakt
Single-walled carbon nanotubes (SWCNTs)
exhibit excellent nonlinear optical (NLO) properties due to the
delocalized π electron states present along their tube axis. Using the
open aperture Z-scan method in tandem with X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy,
we demonstrate the simultaneous tailoring of both electronic and NLO
properties of SWCNTs, from ultrafast (femtosecond) to relatively slow
(nanosecond) timescales, by doping with a single substituent, viz., boron. SWCNTs were doped via a wet chemical method using B2O3, and the boron content and bonding configurations were identified using XPS.
While in the ns excitation regime, the nonlinear absorption was found
to increase with increasing boron concentration in the SWCNTs (due to
the increasing disorder and enhanced metallicity of the SWCNTs), the
saturation intensity in the fs excitation regime decreased. We attribute
this counter-intuitive behavior to excited state absorption on ns
timescales, and saturable absorption combined with weak two-photon transitions on fs timescales between van Hove singularities.
- Organisation(en)
- Elektronische Materialeigenschaften
- Externe Organisation(en)
- Sri Sathya Sai Institute of Higher Learning, Clemson University, East Carolina University, Raman Research Institute, University of Texas, Dallas
- Journal
- Nanoscale
- Band
- 5
- Seiten
- 7271-7276
- Anzahl der Seiten
- 6
- ISSN
- 2040-3364
- DOI
- https://doi.org/10.1039/c3nr01803b
- Publikationsdatum
- 2013
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103020 Oberflächenphysik, 103009 Festkörperphysik, 103018 Materialphysik
- Schlagwörter
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/5d3880a3-2034-402d-b7ef-aa08a63e8ceb