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Precision Milling of Carbon Nanotube Forests Using Low Pressure Scanning Electron Microscopy

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Smallest carbon nanotube assigned with atomic resolution accuracy.

Lunhui Guan¹, Kazu Suenaga, Sumio Iijima

¹Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology Tsukuba, 305-8565, Japan. guan-lunhui@aist.go.jp

|January 12, 2008

Summary

Researchers identified the smallest carbon nanotubes, including the (3,3) chiral index, for the first time. These nanotubes are unstable and require protection from electron beams, challenging prior theoretical predictions.

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Area of Science:

Nanotechnology
Materials Science
Condensed Matter Physics

Background:

Characterizing small carbon structures is crucial for understanding their properties.
Previous theoretical models may not fully capture the behavior of ultra-small carbon nanotubes.

Purpose of the Study:

To experimentally identify and characterize the smallest possible carbon nanotubes.
To investigate the stability and structural properties of these novel nanotubes.

Main Methods:

Synthesis of ultra-small carbon nanotubes within larger single-wall carbon nanotubes.
Aberration-corrected high-resolution transmission electron microscopy (HR-TEM) for definitive structural analysis.

Main Results:

Unambiguous identification of carbon nanotubes with chiral indices (3,3), (4,3), and (5,1).

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Experimental assignment of chiral indices confirmed by HR-TEM.

The (3,3) nanotube exhibits unexpected instability and high sensitivity to electron beams.

The cap structure of the (3,3) nanotube aligns with a C20 fullerene half-dome model.

Conclusions:

The first experimental evidence for the existence of the smallest carbon nanotubes.
The instability of the (3,3) nanotube highlights the need for protective environments.
Findings challenge existing theoretical predictions regarding nanotube stability and structure.