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Nano-Cylinder Structure Studied by X-ray Diffraction

Published online by Cambridge University Press:  15 March 2011

Gu Xu ,
Zhechuan Feng ,
Zoran Popovic ,
Jianyi Lin  and
Jagadese. J. Vittal
Gu Xu
Affiliation:
Department of Materials Sci. & Eng., McMaster University, Hamilton, L8S 4L7, Canada
Zhechuan Feng
Affiliation:
Axcel Photonics Inc., 45 Bartlett Street, Marlborough, Massachusetts, 01752
Zoran Popovic
Affiliation:
Xerox Research Center of Canada, Mississauga, Ontario, L5K 2L1, Canada
Jianyi Lin
Affiliation:
Department of Physics, National University of Singapore, 119260, Singapore
Jagadese. J. Vittal
Affiliation:
Department of Chemistry, National University of Singapore, 119260, Singapore
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Abstract

The study of nano-cylinder structure has attracted much attention due to the application of multi-wall carbon nanotubes (MWCNTs). While some TEM observations indicate that they are formed by seamless concentric cylinders, other TEM and high pressure X-ray diffraction studies suggest that they look like scrolls of graphite sheets. Although many people now accept the concentric cylinder model, there has been no confirmation reported. On the other hand, this structural difference of MWCNTs plays a crucial role in determining the properties and suitability for future applications. For example, the periodical boundary condition can only be imposed for cylinders, but not for scrolls. To resolve this issue, we employed high-resolution X-ray diffraction to measure detailed profiles of the Bragg peaks for high-purity MWCNTs. We then identified some unusual observations unique to the nano-cylinder structure, followed by the analysis of the structural difference in the Fourier transform between nanotubes formed by scrolls and concentric cylinders. The simulation results are then compared with the experimental data to reveal the structural details.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V2.6
Copyright
Copyright © Materials Research Society 2002

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