Chiral-angle distribution for separated single-walled carbon nanotubes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 18729412.
- Also identified by DOI 10.1021/nl801364g.
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Abstract
Chiral indices (n, m) of metallic and semiconducting single-walled carbon nanotubes (SWNTs) selectively separated via the density-gradient ultracentrifugation process were individually assigned by using an aberration-corrected transmission electron microscope (TEM) operated at 80 kV. Our statistical analysis revealed that armchair (n, n) and chiral (n, n-3) SWNTs with large chiral angles (>20 degrees) are dominant metallic nanotubes in the separated samples, whereas such a noticeable preference of particular indices was not observed for semiconducting nanotubes. Some significant discrepancies were found between the TEM and spectroscopic results on the major chiral indices and the metal/semiconductor ratios in these SWNTs.
Medical subject headings
- Electronics
- Nanotechnology
- Nanotubes, Carbon