The use of camphor-grown carbon nanotube array as an efficient field emitter
The use of camphor-grown carbon nanotube array as an efficient field emitter
复制标题
DOI：
10.1016/j.carbon.2007.04.023
复制
发表时间：
2007-08
期刊：
影响因子：
10.9
通讯作者：
Mukul Kumar;T. Okazaki;M. Hiramatsu;Y. Ando
中科院分区：
文献类型：
--
作者：
Mukul Kumar;T. Okazaki;M. Hiramatsu;Y. Ando
通过植物碳源樟脑在不同催化剂浓度下的热分解，在硅、镍涂层硅和钴涂层硅基底上实现了排列良好的高纯度多壁碳纳米管（CNT）的三维生长。对平行板二极管配置中生长的纳米管的场发射研究表明，它们是一种高效的发射极，其开启场为~1V/μm（对于10μA/cm2），阈值场为~4V/μm（对于10mA/cm2）。 5.6V/μm 时的最大电流密度范围为 20–30mA/cm2，具有显着的可逆性。樟脑生长的 CNT 发射器的长期稳定性测试表明，在连续运行下，其使用寿命约为 5 个月。碳纳米管的金属辅助电子发射这一新功能已经得到解决。在场发射显微镜中用作冷阴极的孤立纳米管揭示了五边形发射位点，从而揭示了纳米管尖端的原子结构。
Three-dimensional growth of well-aligned high-purity multiwall carbon nanotubes (CNTs) is achieved on silicon, nickel-coated silicon and cobalt-coated silicon substrates by thermal decomposition of a botanical carbon source, camphor, with different catalyst concentrations. Field emission study of as-grown nanotubes in a parallel-plate diode configuration suggests them to be an efficient emitter with a turn-on field of ∼1V/μm (for 10μA/cm2) and a threshold field of ∼4V/μm (for 10mA/cm2). Maximum current density lies in a range of 20–30mA/cm2at 5.6V/μm with significant reversibility. Prolonged stability test of camphor-grown CNT emitters suggests a life time of ∼5months under continuous operation. A new feature, metal-assisted electron emission from CNTs, has been addressed. Isolated nanotubes used as a cold cathode in a field emission microscope reveal the pentagonal emission sites and hence the atomic structure of the nanotube tips.