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Pressure-induced Structural Phase Transition of Carbon Nanotubes into New Nanostructured Carbon Solids

Published online by Cambridge University Press:  31 January 2011

Masahiro Sakurai  and
Susumu Saito
Masahiro Sakurai
Affiliation:
sakurai@stat.phys.titech.ac.jp, Tokyo Institute of Technology, Department of Physics, Tokyo, Japan
Susumu Saito
Affiliation:
saito@stat.phys.titech.ac.jp, Tokyo Institute of Technology, Department of Physics, Tokyo, Japan
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Abstract

We study pressure-induced structural phase transition of carbon nanotubes using the constant-pressure tight-binding molecular-dynamics simulation. The systems studied are nanotube bundles composed of (6,6) armchair nanotube and/or (7,4) chiral nanotube, which are reported to be the nanotubes relatively abundant in experimentally purified sample. We find that the nanotube bundles transforms into a new phase that consist of graphitic ribbons and diamond blocks, “graphitic nanoribbon solid”. It is also found that sp3-rich phases obtained from the armchair nanotubes possess an anisotropic network and have high hardness which is comparable to that of cubic diamond. In the case of the bundles containing chiral nanotubes, on the other hand, amorphous diamond phase is obtained. Based on the local-density approximation in the density-functional theory, we also investigate the energetics and electronic structure of some of new carbon phases obtained in the molecular-dynamics study.

Keywords

Cnanostructurephase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1204: Symposium K – Nanotubes and Related Nanostructures-2009 , 2009 , 1204-K05-24
Copyright
Copyright © Materials Research Society 2010

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