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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

Published on: July 2, 2012

Artificial lamellar mesostructures to WS(2) nanotubes.

Yadong D Li¹, Xiaolin L Li, Rongrui R He

¹Department of Chemistry, Key Laboratory of Atomic & Molecular Nanosciences, Ministry of Education, Tsinghua University, Beijing 100084, People's Republic of China.

Journal of the American Chemical Society

|February 14, 2002

Summary

Researchers developed a direct pyrolysis method to synthesize tungsten disulfide (WS2) nanotubes from artificial lamellar mesostructures. This technique yields bulk quantities of uniform WS2 nanotubes via a rolling mechanism of layered sheets.

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Area of Science:

Materials Science
Nanotechnology
Inorganic Chemistry

Background:

Tungsten disulfide (WS2) nanotubes are promising nanomaterials with unique electronic and mechanical properties.
Previous synthesis methods often involve complex procedures or yield limited quantities.

Purpose of the Study:

To develop a direct and efficient method for synthesizing bulk quantities of tungsten disulfide (WS2) nanotubes.
To elucidate the formation mechanism of WS2 nanotubes.

Main Methods:

Preparation of a tungsten sulfide artificial lamellar mesostructure composite (WS-L) using template self-assembly of anionic tungstates and cationic surfactants.
Direct pyrolysis of the WS-L composite at 850°C in an argon atmosphere.

Main Results:

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Bulk quantities of uniform WS2 nanotubes with diameters of 5-37.5 nm and lengths of 0.2-5 microm were successfully synthesized.
Transmission electron microscopy observations supported a general rolling mechanism of layered sheets for nanotube formation.

Conclusions:

The direct pyrolysis of artificial lamellar mesostructures offers an efficient route for WS2 nanotube synthesis.
The study provides insights into the rolling mechanism governing the formation of these nanotubes.