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Related Experiment Video

Updated: Apr 16, 2026

Precision Milling of Carbon Nanotube Forests Using Low Pressure Scanning Electron Microscopy
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How a zigzag carbon nanotube grows.

Qinghong Yuan1, Feng Ding

  • 1Department of Physics, East China Normal University, Shanghai, 200241 (China); Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hong Kong (China). qhyuan@phy.ecnu.edu.cn.

Angewandte Chemie (International Ed. in English)
|March 14, 2015
PubMed
Summary

Zigzag carbon nanotubes (CNTs) grow slower than other types due to a high energy barrier for ring initiation. This explains why zigzag CNTs are rarely found in samples, completing CNT growth theory.

Keywords:
carbon nanotubeschiralitykineticsnucleationzigzag carbon nanotubes

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Carbon nanotubes (CNTs) exhibit diverse structural isomers, including zigzag (ZZ), chiral, and armchair (AC) types.
  • The growth mechanisms of CNTs are crucial for controlling their synthesis and properties.
  • Experimental observations frequently report a scarcity of ZZ-CNTs in synthesized samples.

Purpose of the Study:

  • To elucidate the distinct ring-by-ring growth behavior of ZZ-CNTs compared to other CNT types.
  • To explain the low abundance of ZZ-CNTs in experimental samples.
  • To advance the theoretical understanding of CNT growth dynamics.

Main Methods:

  • First-principle calculations were employed to investigate the atomic-level growth processes.
  • Analysis focused on the energy barriers for carbon ring initiation at the rim of ZZ-CNTs.
  • Growth rates were compared across different CNT structures.

Main Results:

  • ZZ-CNTs possess a unique growth mechanism with a high energy barrier for initiating new carbon rings at their rims.
  • The growth rate of ZZ-CNTs is directly proportional to their diameter.
  • ZZ-CNTs grow 10 to 1000 times slower than chiral and armchair CNTs.

Conclusions:

  • The high energy barrier for ring initiation fundamentally limits ZZ-CNT growth.
  • This finding provides a theoretical explanation for the experimental observation of ZZ-CNT scarcity.
  • The study completes a significant aspect of the theory of carbon nanotube growth.