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Journal of Nanotechnology
Volume 2012 (2012), Article ID 601582, 5 pages
http://dx.doi.org/10.1155/2012/601582
Research Article

Electrical Transport Properties of Multilayered Single-Walled Carbon Nanotube Films

Department of Physics, Florida International University, Miami, FL 33199, USA

Received 3 December 2011; Accepted 17 January 2012

Academic Editor: Rajaram S. Mane

Copyright © 2012 Yanli Zhao and Wenzhi Li. 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

An improved layer-by-layer vacuum filtration method was adopted for the fabrication of single-walled carbon nanotube (SWCNT) films aiming at a series of SWCNT films with controllable thickness and density. The electrical transport properties of the multilayered SWCNT films have been investigated. With the constant film density, the decrease of the layer number of the SWCNT film results in an increase of the temperature coefficient of resistance (TCR). SWCNT film with 95% metallic nanotubes has shown a lower TCR than that of the SWCNT films with a low percentage of metallic nanotubes. The effect of thermal annealing and subsequent acid (HNO3) treatment on the electrical properties of the SWCNT films has also been investigated.