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Growth and field emission of multi-walled carbon nanotubes.

机译:多壁碳纳米管的生长和场发射。

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Vertically-oriented multi-walled carbon nanotubes (MWCNT) were grown via thermal chemical vapor deposition (TCVD) technique under different conditions by using a hydrocarbon gas (ethylene) and a reactive gas (hydrogen). In addition, a Plasma-Enhanced CVD station has been assembled by our group in order to grow vertically-aligned MWCNTs using another hydrocarbon gas (acetylene) and reactive gas (ammonia). These MWCNT will be studied for application to high-power microwave (HPM) amplification and field emission displays. A pulsed diagnostic circuit was designed to minimize the effect of stray capacitive current and was used during the field emission measurement to maximize the emission current while avoiding arcing. Results revealed an emission current of up to 0.8 A/cm2 from the MWCNTs at an applied anode voltage of 6kV. Collected field emission current data was analyzed by using Fowler-Nordheim equation. Careful analysis of such results demonstrated potential for the MWCNTs to be developed into high current-emitting cathodes.
机译:使用碳氢化合物气体(乙烯)和反应性气体(氢气),通过热化学气相沉积(TCVD)技术在不同条件下生长垂直取向的多壁碳纳米管(MWCNT)。此外,我们的小组还组装了一个等离子体增强CVD站,以使用另一种烃类气体(乙炔)和反应性气体(氨)来生长垂直排列的MWCNT。这些MWCNT将被研究用于高功率微波(HPM)放大和场发射显示器。设计脉冲诊断电路以最大程度地减小杂散电容电流的影响,并在现场发射测量期间使用该电路以最大化发射电流,同时避免产生电弧。结果显示,在施加的6kV阳极电压下,MWCNT的发射电流高达0.8 A / cm2。使用Fowler-Nordheim方程分析收集的场发射电流数据。对这些结果的仔细分析表明,MWCNT有可能发展成为高电流发射阴极。

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