Nanotubes as nanoprobes in scanning probe microscopy

Article Abstract:

Carbon nonotubes are effective tips for scanning probe microscopy due to their flexibility and thinness. The tip flexibility makes them resistant to damage from tip crashes. The slenderness of the tips enables imaging of sharp recesses in surface topography. Thus, deep trenches that are inaccessible to high-resolution scanning probes, become accessible with the narrow tips. Electrical conductivity of the multiwalled nanotubes permit them to be used for scanning tunnelling microscopy.

Imaging systems, Scanning tunneling microscopy

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Fullerene 'crop circles.' (circular formations of single-wall carbon nanotube ropes)

Article Abstract:

Circular formations of ropes can be seen on laser-grown single-wall carbon nanotube material through scanning force and transmission electron microscopy. Dubbed 'crop circles,' the ropes comprise of between 10 to 100 aligned nanotubes. Evidence strongly indicates that majority of the individual tubes in the circles are continuous tubes with no ends, or perfect tori. A Kekulean image of a growing nanotube swallowing its own tail is used to explain the formation of toroidal fullerenes.

Analysis, Carbon allotropes

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Electronic structure of atomically resolved carbon nanotubes

Article Abstract:

The electronic properties of carbon nanotubes have attracted much attention since their discovery in 1991. Their electronic conductivity is thought to rely on tube diameter and wrapping angle. The results of scanning tunnelling microscopy and spectroscopy on single-walled nanotubes, confirmed that the electronic properties do depend on the wrapping angle.

Spectrum analysis, Spectroscopy, Microscope and microscopy, Microscopes, Microscopy

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