Field Emission Characteristics of Well-Aligned Carbon Nanotubes Synthesized in Organic Liquids

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概要

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• We have characterized the field electron emission from well-aligned carbon nanotubes (CNTs) synthesized in methanol using cobalt (Co) as a catalyst on silicon (Si) substrates. In order to prepare CNTs aligned vertically to the substrate, the physicochemical state of the Co catalyst was controlled by annealing in air at a temperature of 900 °C as a thermal preoxidation prior to the liquid-phase growth. For the CNT growth, the Co-loaded Si substrate was heated by applying a direct current through the substrate in methanol. Vertically well-aligned CNTs of different crystallinities were synthesized at temperatures of 600 and 900 °C. Field electron emission characteristics of the synthesized well-aligned CNTs were measured using diode-type electrodes in a high-vacuum chamber. A low-threshold electric field of approximately 0.9 V$\cdot$μm-1 and a very stable emission were observed in the CNTs with high crystallinity grown at a temperature of 900 °C.

• 2007-09-30

著者

• NAKAGAWA Kiyoharu

  Department of Chemical Engineering, Kansai University

• Ando Toshihiro

  National Institute For Materials Science

• Gamo Hidenori

  Technical Research Institute Toppan Printing Co. Ltd.

• Nishitani-Gamo Mikka

  Department of Applied Chemistry and Sensor Photonics Research Center, Toyo University, Kawagoe, Saitama 350-8585, Japan

• Shibasaki Takeshi

  Department of Applied Chemistry and Sensor Photonics Research Center, Toyo University, Kawagoe, Saitama 350-8585, Japan

• Nakagawa Kiyoharu

  Department of Applied Chemistry and Sensor Photonics Research Center, Toyo University, Kawagoe, Saitama 350-8585, Japan

• Gamo Hidenori

  Technical Research Institute, Toppan Printing Co., Ltd., Sugito, Saitama 345-8508, Japan

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