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Microscopic Growth Mechanisms for Carbon Nanotubes

Charlier1, De Vita A, Blase

  • 1Institut Romand de Recherche Numerique en Physique des Materiaux, Ecublens, CH-1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|January 31, 1997
PubMed
Summary

Uncatalyzed carbon nanotube growth is hindered by spontaneous dome closure. However, double-walled nanotubes resist closure via "lip-lip" interactions, enabling growth by chemical bonding.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Carbon nanotubes (CNTs) are crucial materials with diverse applications.
  • Understanding CNT growth mechanisms is key to controlling their synthesis.
  • Uncatalyzed growth remains a challenge, often attributed to end-cap formation.

Purpose of the Study:

  • To investigate the uncatalyzed edge growth of carbon nanotubes.
  • To elucidate the mechanisms preventing or enabling CNT growth without catalysts.
  • To explore the role of specific structural features in CNT formation.

Main Methods:

  • Utilizing first-principles molecular dynamics simulations.
  • Analyzing atomic interactions and energy landscapes at experimental temperatures.
  • Simulating the behavior of single-walled and double-walled carbon nanotubes.

Main Results:

  • Single-walled nanotubes spontaneously form closed graphitic domes at experimental temperatures, inhibiting growth.
  • Double-walled nanotubes exhibit "lip-lip" interactions between adjacent tubes, preventing dome closure.
  • The open end of double-walled nanotubes remains chemically active, facilitating the adsorption of carbon fragments.

Conclusions:

  • Spontaneous dome closure explains the lack of uncatalyzed growth in single-walled CNTs.
  • "Lip-lip" interactions in double-walled CNTs enable growth by stabilizing open ends.
  • The findings support a chemisorption model for vapor-phase growth of double-walled carbon nanotubes.

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