Effects of Oxidation during Synthesis on Structure and Field-Emission Property of Tungsten Oxide Nanowires
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概要
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We investigated the structure and field-emission property of tungsten oxide nanowires synthesized under different oxidation degrees. We annealed a sputtered tungsten film at 800 °C, controlling the ratio of hydrogen to oxygen (RHO) using Ar/H2 (97/3%) gas in a vacuum furnace. The resulting differences in shape, number density, length, and width of the nanowires were observed by scanning electron microscopy. In the RHO range of 0 to 0.4, beltlike structures were synthesized. In the RHO range of 0.8 to 4, only thin nanowires were synthesized. In this range, length and width did not differ with RHO, but the number density decreased as RHO increased. The sample with a nanowire density of 2 μm-2, annealed with an RHO of 4, showed the highest field-emission property, i.e., a current of 1 mA/cm2 for an electric field of 22 V/μm. We demonstrated their emission by fluorescence imaging and showed that the nanowires are promising candidates for field emitters.
- 2007-09-30
著者
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Nakao Masayuki
Department Of Cardiology Kanagawa Cardiovascular And Respiratry Center
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Ooi Takeshi
Department Of Engineering Synthesis School Of Engineering The University Of Tokyo
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KASUYA Keigo
Department of Engineering Synthesis, The University of Tokyo
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TAKAYAMA Kentaro
Department of Biochemical Pharmacology, Center for Frontier Research in Medicinal Science and 21^
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Kojima Yusuke
Department Of Advanced Bioscience Faculty Of Agriculture Kinki University
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Nagato Keisuke
Department Of Engineering Synthesis Graduate School Of Engineering The University Of Tokyo
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Ooi Takeshi
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Nagato Keisuke
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Nakao Masayuki
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Takayama Kentaro
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Kojima Yusuke
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Kasuya Keigo
Department of Engineering Synthesis, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Kasuya Keigo
Department of Engineering Synthesis, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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