A carbon nanotube field emission cathode with high current density and long-term stability
A carbon nanotube field emission cathode with high current density and long-term stability
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DOI：
10.1088/0957-4484/20/32/325707
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发表时间：
2009-08-12
期刊：
影响因子：
3.5
通讯作者：
Zhou, Otto
中科院分区：
文献类型：
--
作者：
Calderon-Colon, Xiomara;Geng, Huaizhi;Zhou, Otto
目前正在对碳纳米管 (CNT) 场发射器进行广泛的真空电子应用评估。然而，高电流密度下寿命短、高电压下不稳定、发射均匀性差、像素间不一致等问题仍然是器件应用的主要障碍。我们开发了一种电泳工艺来制造具有受控纳米管取向和表面密度以及增强粘附力的复合碳纳米管薄膜。该阴极显着增强了宏观场发射电流密度和高工作电压下的长期稳定性。演示了该 CNT 电子源在高分辨率 X 射线成像中的应用。
Carbon nanotube (CNT) field emitters are now being evaluated for a wide range of vacuum electronic applications. However, problems including short lifetime at high current density, instability under high voltage, poor emission uniformity, and pixel-to-pixel inconsistency are still major obstacles for device applications. We developed an electrophoretic process to fabricate composite CNT films with controlled nanotube orientation and surface density, and enhanced adhesion. The cathodes have significantly enhanced macroscopic field emission current density and long-term stability under high operating voltages. The application of this CNT electron source for high-resolution x-ray imaging is demonstrated.