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Journal of Nanomaterials
Volume 2015 (2015), Article ID 907954, 8 pages
http://dx.doi.org/10.1155/2015/907954
Research Article

Fabrication and Properties of Macroscopic Carbon Nanotube Assemblies Transforming from Aligned Nanotubes

1Science and Technology on Thermostructural Composite Materials Laboratory & State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
3Department of Mechanical Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, UAE

Received 30 November 2014; Revised 14 January 2015; Accepted 14 January 2015

Academic Editor: Hassan Karimi-Maleh

Copyright © 2015 Y. N. Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Macroscale assemblies of well-aligned carbon nanotubes (CNTs) can inherit intrinsic properties from individual CNTs and at the same time ease handling difficulties that occur at nanometer scale when dealing with individual CNTs. Herein, simple fabrication processes are introduced to produce a variety of macroscale CNT assemblies, including well-aligned CNT bundles, CNT films, and CNT fibers, from the same starting material: spinnable CNT arrays. The electrical and mechanical properties of the as-prepared CNT assemblies have been investigated and compared. It is found that CNT films show an electrical conductivity of 145~250 S cm−1 which is comparable to CNT fibers, but two orders magnitude higher than that of conventional Bucky paper. CNT fibers exhibit diameter dependent tensile strength which is mainly attributed to the nonuniform twisting along the radial direction of fibers.