Characterization and field emission properties of multi-walled carbon nanotubes with fine crystallinity prepared by CO₂ laser ablation

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• 作者：Ryota Yuge^a ; ^{r-yuge@bk.jp.nec.com} ; Kiyohiko Toyama^a ; Toshinari Ichihashi^a ; Tetsuya Ohkawa^b ; Yasushi Aoki^b ; Takashi Manako^a
• 关键词：Carbon nanotube ; CO2 laser ablation ; Field emission
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 July, 2012
• 卷：258
• 期：18
• 页码：6958-6962
• 文件大小：1245 K

摘要

Multi-walled carbon nanotubes (MWNTs) were synthesized by irradiating of a CO₂ laser in continuous wave mode onto a boron-containing graphite target at room temperature. The pressure of Ar atmosphere was controlled in 50, 150, 400, or 760 Torr. The diameter of obtained MWNTs was in the range of 5-40 nm. The quantity and degree of graphitization of synthesized MWNTs increased with the Ar gas pressure. A large quantity of MWNTs with fine crystalline structure has been synthesized preferentially at the condition of 760 Torr. The MWNTs with the fine crystalinity indicated highly oxidative stability in O₂. We also found that a large area field emission device with MWNT cathodes indicated good 尾 value of 3.6 脳 10⁴ cm^鈭?, and sufficient reliability for long term operations over 150 h, suggesting promising application to field emission devices.