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Field Emission of Electrons from Carbon Nanotubes with Extremely Sharp Tips and Its Application to Electron Sources

极尖碳纳米管场发射电子及其在电子源中的应用

基本信息

批准号：
09555003
负责人：
SAITO Yahachi
金额：
$ 3.46万
依托单位：
MIE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555003/
关键词：
Carbon nanotude Field emission Electron source Field emission microscopy Multiwall nanotube Single-wall nanotube Display device カーボンファイバー蛍光表示管アーク放電

项目摘要

Carbon nanotubes possess physical and chemical properties favorable for field emitters. In this study, fundamental properties of field emission from carbon nanotubes are elucidated, and nanotube-based field-emission display devices are experimentally manufactured and their performance is examined.1. Electron Emission from Carbon Nanotubes Studied by Field Emission Microscopy (FEM)Field Emission from a variety, of carbon nanotubes, e.g., multiwall nanotube (MWNT), nanografiber (NGF), and single-wall nanotube (SWNT), was investigated by using an FEM apparatus constructed newly. Among the nanotubes studied, oxidized MWNTs with open tips exhibited the most excellent emission properties, and purified SWNTs and NGF were the next good emitters.2. Electron Emission from Films of Carbon Nanotubes Spread on Cathode PlatesWhen the gap between the nanotube cathode and the grid was 1 mm and the grid voltage was 750 V, current density of 2.5 mA/cmィイD12ィエD1 as obtained for NGF, and approximately 0.1 mA/cmィイD12ィエD1 for MWNT and SWNTs.3. Effects of Ambient Gases on Lifetimes of Nanotube EmittersLife tests of MWNT emitters performed under ambient gases of oxygen, water, nitrogen and argon revealed that oxygen was the most hazardous gas for nanotube emitters.4. Fabrication of Nanotube-Base Field Emission Display Elements and Their PerformanceCathode ray tube (CRT) lighting-elements were manufactured by replacing conventional thermionic cathodes with nanotube field emitters. Stable electron emission, high emission current with low electric field (〜10 mA/cmィイD12ィエD1 at 1.5 V/μm), and long life of the emitters were demonstrated.

碳纳米管具有良好的物理和化学性质，有利于场致发射。在本研究中，阐明了碳纳米管场发射的基本特性，并实验制作了基于碳纳米管的场发射显示器件，并对其性能进行了测试.场发射显微镜（FEM）研究碳纳米管的电子发射来自各种碳纳米管的场发射，例如，利用新构建的有限元装置对多壁纳米管（MWNT）、纳米石墨纤维（NGF）和单壁纳米管（SWNT）进行了研究。在所研究的碳纳米管中，具有开放尖端的氧化碳纳米管表现出最优异的发射性能，纯化的单壁碳纳米管和神经生长因子是次佳的发射体.当纳米管阴极和栅极之间的差距为1 mm，栅极电压为750 V时，对于NGF获得的电流密度为2.5 mA/cm ↑ [2] D ↓ [12] D ↓ [1]，对于MWNT和SWNT获得的电流密度约为0.1 mA/cm ↑ [2] D ↓ [12] D ↓ [1].环境气体对纳米管发射体寿命的影响在氧气、水、氮气和氩气的环境气体下进行的MWNT发射体寿命测试显示氧气是对纳米管发射体最有害的气体.纳米管场致发射显示器件的制备及其性能研究用纳米管场致发射体代替传统的阴极射线管（CRT）发光器件。结果表明，该发射极具有稳定的电子发射、低电场下的高发射电流（1.5V/μm时为10 mA/cm ~ 2）和长寿命。