Atomically resolved STM images of carbon nanotube defects produced by Ar+ irradiation

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Abstract

Multiwall carbon nanotubes (MWCNTs) dispersed on graphite on highly oriented pyrolytic graphite (HOPG) substrate were irradiated with Ar+ ions of 30keV. The irradiated samples were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS) in air. The irradiation-induced defects appear as hillocklike protrusions on the nanotube walls, similar to the hillocks observed earlier on ion irradiated HOPG. The results are in agreement with recent predictions, which attribute the STM features produced by ion irradiation to local modifications of the electronic structure. "3×3R" type superstructures are also observed near some of the defects. After annealing at 450°C in nitrogen atmosphere, the irradiated MWCNTs were investigated again by STM. The effect of heat treatment on the irradiation-induced nanotube defects is also discussed.

Original languageEnglish
Article number045429
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number4
DOIs
Publication statusPublished - Jul 15 2005

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Carbon Nanotubes
Graphite
Scanning tunneling microscopy
scanning tunneling microscopy
Carbon nanotubes
pyrolytic graphite
carbon nanotubes
Irradiation
Nanotubes
Defects
irradiation
nanotubes
defects
Ions
Ion bombardment
ion irradiation
Electronic structure
ions
heat treatment
Nitrogen

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Atomically resolved STM images of carbon nanotube defects produced by Ar+ irradiation",
abstract = "Multiwall carbon nanotubes (MWCNTs) dispersed on graphite on highly oriented pyrolytic graphite (HOPG) substrate were irradiated with Ar+ ions of 30keV. The irradiated samples were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS) in air. The irradiation-induced defects appear as hillocklike protrusions on the nanotube walls, similar to the hillocks observed earlier on ion irradiated HOPG. The results are in agreement with recent predictions, which attribute the STM features produced by ion irradiation to local modifications of the electronic structure. {"}3×3R{"} type superstructures are also observed near some of the defects. After annealing at 450°C in nitrogen atmosphere, the irradiated MWCNTs were investigated again by STM. The effect of heat treatment on the irradiation-induced nanotube defects is also discussed.",
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T1 - Atomically resolved STM images of carbon nanotube defects produced by Ar+ irradiation

AU - Osváth, Z.

AU - Vértesy, G.

AU - Tapasztó, L.

AU - Wéber, F.

AU - Horváth, Z.

AU - Gyulai, J.

AU - Bíró, L.

PY - 2005/7/15

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N2 - Multiwall carbon nanotubes (MWCNTs) dispersed on graphite on highly oriented pyrolytic graphite (HOPG) substrate were irradiated with Ar+ ions of 30keV. The irradiated samples were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS) in air. The irradiation-induced defects appear as hillocklike protrusions on the nanotube walls, similar to the hillocks observed earlier on ion irradiated HOPG. The results are in agreement with recent predictions, which attribute the STM features produced by ion irradiation to local modifications of the electronic structure. "3×3R" type superstructures are also observed near some of the defects. After annealing at 450°C in nitrogen atmosphere, the irradiated MWCNTs were investigated again by STM. The effect of heat treatment on the irradiation-induced nanotube defects is also discussed.

AB - Multiwall carbon nanotubes (MWCNTs) dispersed on graphite on highly oriented pyrolytic graphite (HOPG) substrate were irradiated with Ar+ ions of 30keV. The irradiated samples were investigated by scanning tunneling microscopy (STM) and spectroscopy (STS) in air. The irradiation-induced defects appear as hillocklike protrusions on the nanotube walls, similar to the hillocks observed earlier on ion irradiated HOPG. The results are in agreement with recent predictions, which attribute the STM features produced by ion irradiation to local modifications of the electronic structure. "3×3R" type superstructures are also observed near some of the defects. After annealing at 450°C in nitrogen atmosphere, the irradiated MWCNTs were investigated again by STM. The effect of heat treatment on the irradiation-induced nanotube defects is also discussed.

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