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Proceedings Paper

STM and STS investigation of few-wall carbon nanotubes containing non-hexagonal carbon rings
Author(s): Zoltan Osvath; Laurent Fulcheri; Geza István Mark; Levente Tapaszto; Jozsef Gyulai; Laszlo P. Biro
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Paper Abstract

We performed scanning tunneling microscopy (STM) measurements on few wall carbon nanotubes that exhibited changing diameter. Such change in the diameter may occur if non-hexagonal carbon ring configurations are introduced in the nanotube walls. A few-walled nanotube knee of 4 degrees, with different diameter values on the two sides of the knee was imaged by STM. Theoretical model structures [1] of single-wall carbon nanotubes show that a bend of 4 degrees may occur when a pentagonal and a heptagonal carbon ring is incorporated side by side in the hexagonal nanotube structure. Scanning tunneling spectroscopic (STS) measurements show that additional electronic states are present in the energy gap in the region where the bend occurs. We also performed STS measurements on a single-wall nanotube with conical tip. In agreement with theory, the results show that the energy gap in the tapered end is larger than in the nanotube.

Paper Details

Date Published: 29 April 2003
PDF: 7 pages
Proc. SPIE 5118, Nanotechnology, (29 April 2003); doi: 10.1117/12.498988
Show Author Affiliations
Zoltan Osvath, Research Institute for Technical Physics and Materials Sciences (Hungary)
Laurent Fulcheri, Ecole des Mines de Paris (France)
Geza István Mark, Research Institute for Technical Physics and Materials Sciences (Hungary)
Levente Tapaszto, Research Institute for Technical Physics and Materials Sciences (Hungary)
Jozsef Gyulai, Research Institute for Technical Physics and Materials Sciences (Hungary)
Laszlo P. Biro, Research Institute for Technical Physics and Materials Sciences (Hungary)


Published in SPIE Proceedings Vol. 5118:
Nanotechnology
Robert Vajtai; Xavier Aymerich; Laszlo B. Kish; Angel Rubio, Editor(s)

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