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Journal of Nanomaterials
Volume 2013, Article ID 536302, 9 pages
http://dx.doi.org/10.1155/2013/536302
Research Article

Field Emission Properties of the Graphene Double-Walled Carbon Nanotube Hybrid Films Prepared by Vacuum Filtration and Screen Printing

1Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
2Herbert Gleiter Institute of Nanoscience, Nanjing University of Science & Technology, 200 Xiaolinwei Road, Nanjing 210094, China

Received 26 September 2013; Accepted 25 October 2013

Academic Editor: Hui Xia

Copyright © 2013 Jinzhuo Xu 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

The graphene double-walled carbon nanotube (DWCNT) hybrid films were prepared by vacuum filtration and screen printing. Their electron field emission properties have been studied systematically. The electron emission properties of the hybrid films are much better than those of pure DWCNT films and pure graphene films. Comparing with the screen printed films, the vacuum filtered films have many advantages, such as lower turn-on field, higher emission current density, better uniformity, better long-term stability, and stronger adhesive strength with conductive substrates. The optimized hybrid films with 20% weight ratio of graphene, which were fabricated by vacuum filtration, show the best electron emission performances with a low turn-on field of 0.50 V m−1 (at 1  Acm−2) and a high field enhancement factor of 27000.