STM and STS investigation of few-wall carbon nanotubes containing non-hexagonal carbon rings

Zoltan Osvath; Laurent Fulcheri; Geza István Mark; Levente Tapaszto; Jozsef Gyulai; Laszlo P. Biro

doi:10.1117/12.498988

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29 April 2003 STM and STS investigation of few-wall carbon nanotubes containing non-hexagonal rings

Zoltan Osvath, Laurent Fulcheri, Geza István Mark, Levente Tapaszto, Jozsef Gyulai, Laszlo P. Biro

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Proceedings Volume 5118, Nanotechnology; (2003) https://doi.org/10.1117/12.498988
Event: Microtechnologies for the New Millennium 2003, 2003, Maspalomas, Gran Canaria, Canary Islands, Spain

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.

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Zoltan Osvath, Laurent Fulcheri, Geza István Mark, Levente Tapaszto, Jozsef Gyulai, and Laszlo P. Biro "STM and STS investigation of few-wall carbon nanotubes containing non-hexagonal rings", Proc. SPIE 5118, Nanotechnology, (29 April 2003); https://doi.org/10.1117/12.498988

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