The role of fullerene hemispheres in determining structural features of finite-length carbon nanotubes

Takashi Yumura, Shunji Bandow, Kazunari Yoshizawa, Sumio Iijima

研究成果: ジャーナルへの寄稿記事

39 引用 (Scopus)

抄録

Geometrical and electronic features of the armchair C40+20n and zigzag C42+18n nanotubes capped with fullerene hemispheres, in which n is the number of cyclic cis- and trans-polyene chains involved in the nanotubes, are analyzed from density functional theory (DFT) calculations. To illuminate the role of the fullerene hemispheres in their structures, the corresponding nanotubes terminated by H atoms, C20nH20 and C18nH18, are also studied in terms of orbital interactions. Although there are various bond-deformation patterns within the cis-polyene chains in the C20nH20 series, the C 40+20n series always have similar bond-length alternate patterns, in which the C-C bonds along the tube axis are shortened, whereas the C-C bonds around the belts are lengthened. The bond-deformation patterns in the C 42+18n series are also different from those in the C 18nH18 series; the structures of the capped and uncapped zigzag nanotubes exhibit Kekulé- and Clar-networks, respectively. The geometrical change in the capped nanotubes is a consequence of orbital interactions in the cylindrical segments with the fullerene hemispheres. Accordingly, the fullerene hemispheres play a dominant role in determining the geometrical and electronic properties of the capped nanotubes. DFT calculations also demonstrate that the geometries of the armchair series exhibit an oscillatory behavior as the chain width with a periodicity of 3. The interesting nanometer size effect is reasonably understood from significant interchain interactions between the cyclic cis-polyene chains involved. In contrast, the geometrical features in the zigzag series are irrespective of the chain width, due to nodal properties of the single rrans-polyene chains.

元の言語英語
ページ(範囲)11426-11434
ページ数9
ジャーナルJournal of Physical Chemistry B
108
発行部数31
DOI
出版物ステータス出版済み - 8 5 2004

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Fullerenes
Nanotubes
Carbon Nanotubes
hemispheres
fullerenes
Polyenes
Carbon nanotubes
nanotubes
carbon nanotubes
Density functional theory
density functional theory
orbitals
Bond length
interactions
Periodicity
electronics
Electronic properties
periodic variations
tubes
Atoms

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

これを引用

The role of fullerene hemispheres in determining structural features of finite-length carbon nanotubes. / Yumura, Takashi; Bandow, Shunji; Yoshizawa, Kazunari; Iijima, Sumio.

:: Journal of Physical Chemistry B, 巻 108, 番号 31, 05.08.2004, p. 11426-11434.

研究成果: ジャーナルへの寄稿記事

Yumura, Takashi ; Bandow, Shunji ; Yoshizawa, Kazunari ; Iijima, Sumio. / The role of fullerene hemispheres in determining structural features of finite-length carbon nanotubes. :: Journal of Physical Chemistry B. 2004 ; 巻 108, 番号 31. pp. 11426-11434.
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abstract = "Geometrical and electronic features of the armchair C40+20n and zigzag C42+18n nanotubes capped with fullerene hemispheres, in which n is the number of cyclic cis- and trans-polyene chains involved in the nanotubes, are analyzed from density functional theory (DFT) calculations. To illuminate the role of the fullerene hemispheres in their structures, the corresponding nanotubes terminated by H atoms, C20nH20 and C18nH18, are also studied in terms of orbital interactions. Although there are various bond-deformation patterns within the cis-polyene chains in the C20nH20 series, the C 40+20n series always have similar bond-length alternate patterns, in which the C-C bonds along the tube axis are shortened, whereas the C-C bonds around the belts are lengthened. The bond-deformation patterns in the C 42+18n series are also different from those in the C 18nH18 series; the structures of the capped and uncapped zigzag nanotubes exhibit Kekul{\'e}- and Clar-networks, respectively. The geometrical change in the capped nanotubes is a consequence of orbital interactions in the cylindrical segments with the fullerene hemispheres. Accordingly, the fullerene hemispheres play a dominant role in determining the geometrical and electronic properties of the capped nanotubes. DFT calculations also demonstrate that the geometries of the armchair series exhibit an oscillatory behavior as the chain width with a periodicity of 3. The interesting nanometer size effect is reasonably understood from significant interchain interactions between the cyclic cis-polyene chains involved. In contrast, the geometrical features in the zigzag series are irrespective of the chain width, due to nodal properties of the single rrans-polyene chains.",
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