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Research Letters in Materials Science
Volume 2007, Article ID 59167, 5 pages
Research Letter

Preparation of Powdery Carbon Nanotwist and Application to Printed Field Emitter

1Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi, Aichi 441-8580, Japan
2Fundamental Research Department, Toho Gas Co., Ltd., 507-2 Shinpo, Tokai, Aichi 476-8501, Japan
3Research and Development Center, Futaba Corporation, 1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba 299-4395, Japan
4Fuji Research Laboratory, Tokai Carbon Co., Ltd., 394-1 Subashiri, Oyama, Sunto, Shizuoka 410-1431, Japan

Received 9 October 2007; Accepted 5 December 2007

Academic Editor: Peter Majewski

Copyright © 2007 Yuji Hosokawa 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.


In the present study, an automatic production system with sequencer control for the synthesis of carbon nanofibriform based on catalytic CVD using a substrate was developed. The carbon nanotwist (CNTw), which is one of the helical carbon nanofibers, was then synthesized in powdery form with an Ni–SnO2-composed catalyst. The production rate was 5 400 times that of the conventional CVD system and Ni–Cu–In2O3 catalyst. The powdery CNTw was easily scraped off the substrate, then pasted with organic binder, and printed by a squeegee method on ITO glass substrate for an electron field emitter. The field emission performance was found to be better than that of the directly grown CNTw film in conventional CVD with Ni–Cu catalyst.