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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 [J. Han et al., Phys. Rev. B 57 (1998) 14983] of single wall carbon nanotubes show that a bend of 4° may occur when a pentagonal and a heptagonal carbon ring is incorporated side by side in the hexagonal nanotube structure (i.e. "fused defect"). 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 a conical tip. In agreement with theory, the results show that the energy gap in the tapered end is larger than in the nanotube.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages587-593
Number of pages7
Volume5118
DOIs
Publication statusPublished - 2003
EventNonatechnology - Maspalomas, Gran Canaria, Spain
Duration: May 19 2003May 21 2003

Other

OtherNonatechnology
CountrySpain
CityMaspalomas, Gran Canaria
Period5/19/035/21/03

Fingerprint

Scanning tunneling microscopy
Nanotubes
scanning tunneling microscopy
Carbon nanotubes
nanotubes
carbon nanotubes
Scanning
Carbon
scanning
carbon
rings
Energy gap
Electronic states
Model structures
Defects
defects
configurations
electronics

Keywords

  • Bend junction
  • Carbon nanotube
  • STM
  • STS
  • Topological defect

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

STM and STS investigation of few wall carbon nanotubes containing non-hexagonal carbon rings. / Osváth, Z.; Fulcheri, Laurent; Márk, G.; Tapasztó, L.; Gyulai, J.; Bíró, L.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5118 2003. p. 587-593.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Osváth, Z, Fulcheri, L, Márk, G, Tapasztó, L, Gyulai, J & Bíró, L 2003, STM and STS investigation of few wall carbon nanotubes containing non-hexagonal carbon rings. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 5118, pp. 587-593, Nonatechnology, Maspalomas, Gran Canaria, Spain, 5/19/03. https://doi.org/10.1117/12.498988
Osváth Z, Fulcheri L, Márk G, Tapasztó L, Gyulai J, Bíró L. STM and STS investigation of few wall carbon nanotubes containing non-hexagonal carbon rings. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5118. 2003. p. 587-593 https://doi.org/10.1117/12.498988
Osváth, Z. ; Fulcheri, Laurent ; Márk, G. ; Tapasztó, L. ; Gyulai, J. ; Bíró, L. / STM and STS investigation of few wall carbon nanotubes containing non-hexagonal carbon rings. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5118 2003. pp. 587-593
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