Transition of Electron Field Emission to Normal Glow Discharge
Transition of Electron Field Emission to Normal Glow Discharge
复制标题
电子场发射到正常辉光放电的转变
DOI：
10.1109/ted.2014.2355858
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发表时间：
2014
影响因子：
3.1
通讯作者：
S. Tedde
中科院分区：
文献类型：
--
作者：
D. Wenger;W. Knapp;B. Hensel;S. Tedde
研究了单壁碳纳米管（SWCNT）/石墨烯混合样品在直流模式和脉冲模式下的场发射（FE）特性，脉冲开启时间在0.2 ~ 400 ms之间，占空比在1%~ 80%之间，采用不锈钢阳极。我们的直流测量显示，在电流大于10 mA时，已经过渡到辉光放电（GD）。最大电流高达400 mA的脉冲I-V特性受到阴极电阻的限制，阴极电阻由发射层电阻和接触电阻组成，发现其在1.1和1.4 k Ω之间。减去阴极电阻后出现恒压行为。这种恒定电压的行为，观察到的发光过程中FE，和时间分辨的测量提供了证据的过渡Fowler-Nordheim型FE FE增强GD。FE实现了到正常GD的软过渡，而无需点火电压。建立动态和过渡到GD的时间常数进行了评估和讨论。还比较了使用铜和钼阳极的FE和GD行为。
The field emission (FE) properties of single walled carbon nanotube (SWCNT)/graphene hybrid samples were investigated for high currents in dc mode and pulsed mode with pulse-ON times between 0.2 and 400 ms and duty cycles between 1% and 80% with stainless steel anodes. Our dc measurements showed a transition to glow discharge (GD) already at currents larger than 10 mA. The pulsed I-V characteristics with up to 400-mA maximum current were limited by the cathode resistance, consisting of the emitting layer resistance and the contact resistance, which was found to be between 1.1 and 1.4 kQ. A constant-voltage behavior arises after subtracting the cathode resistance. This constant-voltage behavior, the observed glowing during FE, and time-resolved measurements give evidence for the transition of Fowler-Nordheim-type FE to FE enhanced GD. FE enables a soft transition to normal GD without the need of an ignition voltage. The buildup dynamic and the time constants of the transition to GD were evaluated and discussed. The FE and GD behaviors were also compared using copper and molybdenum anodes.