Abstract
We have performed a thorough characterization of 1.4 nm-diameter
single-walled carbon nanotubes (SWCNTs) separated according to their
metallicity by optical absorption (OAS), X-ray photoelectron (XPS),
ultraviolet photoelectron (UPS), and multifrequency Raman spectroscopy.
The OAS, XPS, and UPS data prove a high purity (99%)
of SWCNTs. The C 1s core level XPS spectra of the separated nanotubes
show different spectral widths, asymmetry, and peak positions. The UPS
spectra of the samples demonstrate clearly defined van Hove
singularities. Significant differences are observed in the Raman
spectra of the separated nanotubes. Our findings suggest that for
further advances in SWCNT metallicity sorting, Raman spectroscopy has
to be applied to assess purity levels beyond the detection limits of
OAS, XPS, and UPS.
| Original language | English |
|---|---|
| Pages (from-to) | 2512–2518 |
| Number of pages | 7 |
| Journal | Physica Status Solidi. B: Basic Research |
| Volume | 252 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2015 |
Austrian Fields of Science 2012
- 205017 Materials engineering
Keywords
- BUNDLES
- COPPER
- ELECTRONIC-STRUCTURE
- ENCAPSULATION
- GROWTH
- HALOGENIDES
- RAMAN-SPECTROSCOPY
- Raman spectroscopy
- SILVER
- SPECTRA
- TOMONAGA-LUTTINGER-LIQUID
- X-ray photoelectron spectroscopy
- carbon nanotube
- density gradient ultracentrifugation
- metallicity sorting
- Carbon nanotube
- Metallicity sorting
- Density gradient ultracentrifugation