Atmospheric pressure field electron emission from nanostructures

A. Ağıral, J. Gardeniers
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引用次数: 1

Abstract

Atmospheric pressure field emission operation of 2 mum gap diode utilizing crystalline W18O49 nanowires, which were grown on sputter deposited tungsten films by thermal annealing at 700degC in ethene and nitrogen, was demonstrated. Field emission measurements in air follows Fowler-Nordheim electron tunneling theory and showed a low turn-on field of 3.3 V/mum, excellent stability and reproducibility with high emission current density (28 mA/cm2). At high electric fields (> 13 V/mum), current density diverged from Fowler-Nordheim equation and space charge limited conduction was observed. Explosion of emitters was observed similar to breakdown of small contact gaps in vacuum under overloading with high density field emission current. Resistive heating and the Nottingham mechanism may have produced the increased temperature during emission. Viability of pulsed electron emission at atmospheric pressure was demonstrated by applying a 100 Hz square wave voltage to the cathode. Pulsed electron emission with good repetition rate was observed.
纳米结构的大气压力场电子发射
利用W18O49晶体纳米线生长在溅射沉积的钨薄膜上,在乙烯和氮气中进行700℃的热退火,实现了2 μ m隙二极管的常压场发射。在空气中的场发射测量遵循Fowler-Nordheim电子隧道理论,显示出3.3 V/mum的低导通场,具有优异的稳定性和再现性,具有高发射电流密度(28 mA/cm2)。在高电场(> 13 V/mum)下,观察到电流密度偏离Fowler-Nordheim方程和空间电荷限制导通。在高密度场发射电流的过载作用下,发射体的爆炸类似于真空中小接触间隙的击穿。电阻加热和诺丁汉机制可能在排放过程中产生温度升高。通过对阴极施加100赫兹的方波电压,证明了在常压下脉冲电子发射的可行性。观察到脉冲电子发射具有良好的重复率。
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