1. Extracting subnanometer single shells from ultralong multiwalled carbon nanotubes.
- Author
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Byung Hee Hong, Small, Joshua P., Purewal, Meninder S., Mullokandov, Asher, Sfeir, Matthew Y., Feng Wang, Ju Young Lee, Heinz, Tony F., Brus, Louis E., Philip Kim, Kim, Kwang S., and Lieber, Charles M.
- Subjects
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NANOTUBES , *FULLERENES , *CARBON , *ATOMIC force microscopy , *RAMAN spectroscopy , *SPECTRUM analysis - Abstract
We report a simple but powerful method for engineering multi-walled carbon nanotubes (MWNTs) by using manipulation by an atomic-force microscope. The successive shell-by-shell extraction process of ultralong MWNTs allows the exposure of the innermost single-walled carbon nanotubes (SWNTs), which have diameters as small as ≈0.4 nm. The inner-shell extraction process changes the electrical characteristics of the MWNTs. Whereas the outer hollowed-out nanotubes show either metallic or semiconducting character, the innermost SWNTs of small diameter exhibit predominantly metallic transport properties. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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