Efficient Carbon Nanotube Field Emitter Using Electrospun Carbon Nanofibers as a Flexible Electrode
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1173-U06-03
Efficient Carbon Nanotube Field Emitter Using Electrospun Carbon Nanofibers as a Flexible Electrode Hidetoshi Matsumoto1, Kenichi Suzuki1, Kazuma Tsuboi1, Mie Minagawa1, Akihiko Tanioka1, Yasuhiko Hayashi2, Kazuyuki Fukuzono3, and Gehan A. J. Amaratunga4 1 Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan 2 Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan 3 Seiwa Electric Mfg. Co., Ltd., 36 Terada-Shinike, Joyo, Kyoto 610-0192, Japan 4 Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom
ABSTRACT Thermal-stable, conductive, and flexible carbon fabric (CF), which is composed of thin carbon fibers prepared by electrospinning, was used for the substrate of carbon nanotube (CNT) field emitter arrays. The field emitter arrays were prepared by chemical vapor deposition (CVD). The current density-electric field characteristics revealed that the CNT field emitter arrays on CF produced a higher current density at a lower turn-on voltage compared to ones on a Si substrate. This emitter integrated with a gate electrode based on hierarchy-structured carbon materials, CNTs on CF, can be used for light sources, displays, and other electronic devices.
INTRODUCTION Carbon nanotubes (CNTs) have attracted much attention because of their unique physical properties such as high conductivity, chemical stability, and mechanical strength, due to their strong C-C covalent bonds and high aspect ratio [1]. In particular, CNTs present the ideal geometry for field emission (FE) [2]. Therefore, CNTs are currently studied as field emission electron sources for various applications such as a light source, microwave amplifiers, electron guns, X-ray sources, parallel electron beam lithography, and flat panel displays. CNTs are commonly fabricated on Si [3] or glass [4] substrates by chemical vapor deposition (CVD). CVD at high temperature leads to the vertically aligned CNTs on a substrate with strong bonding between CNT and a substrate. Several studies have described the preparation of CNTs emitters on flexible polymer films [5]. However, it is still quite difficult to fabricate CNTs on polymer films because polymers cannot tolerate high temperature. In the present study, we used carbon fabric (CF) composed of thin carbon fiber as the substrate of the CNT field emitter arrays because of their high thermal stability, electrical conductivity, and flexibility. EXPERIMENT Electrospinning is a straightforward method based on an electrohydrodynamic process for forming nanomicroscaled fibers (typically nonwoven fabrics) from organic and inorganic
materials [6-7]. We have reported the preparation of CFs by electrospinning in our previous paper [8]. In the present study, phenolic resin (novolac type, Mw= 4,000-5,000, Gun-ei Chemical, Japan) and poly(vinyl butyral) (PVB) (Mw= 340,000, Wako, Japan) were dissolved in methanol. Pyridine (extra-pure grad
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