High current density nanofilament cathodes for microwave amplifiers

Technical Digest of the 17th International Vacuum Nanoelectronics Conference (IEEE Cat. No.04TH8737) Pub Date : 2004-07-11 DOI:10.1109/IVNC.2004.1355014

J. Schnell, E. Minoux, L. Gangloff, P. Vincent, P. Legagneux, D. Dieurnegard, J. David, F. Peauger, L. Hudanski, K. Teo, R. Lacerda, M. Chhowalla, D. Hasko, H. Ahmed, G. Amaratunga, W. Milne, L. Vila, L. Dauginet-De Pra, S. Demoustier‐Champagne, E. Ferain, R. Legras, L. Piraux, O. Groening, H. De Raedt, K. Michielsen

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引用次数: 2

Abstract

We study high current density nanofilament cathodes for microwave amplifiers. Two different types of aligned nanofilament array have been studied: first, metallic nanowires grown by electrodeposition into nanoporous templates at very low temperature (T<100/spl deg/C) on a silicon wafer; second, carbon nanotubes/nanofibers (CNs) grown by catalytic plasma enhanced chemical vapour deposition. The fabrication process and the field emission properties of these two types of cathodes will be presented. Presently, the best results are obtained with CN cathodes. Arrays of 5.8 /spl mu/m height and 50 nm diameter CNs exhibit geometrical enhancement factor (h/r) of 240/spl plusmn/7.5%. Moreover, currents close to 100 /spl mu/A per emitter have been measured using a scanning anode field emission microscope. Due to these properties, 0.5 /spl times/ 0.5 mm/sup 2/ arrays emit a 2 mA current corresponding to 0.8 A/cm/sup 2/, in DC mode. The use of these cold cathodes in microwave triodes delivering 10 to 50 W at 30 GHz will be discussed for future telecommunication applications.

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微波放大器用高电流密度纳米丝阴极

研究了用于微波放大器的高电流密度纳米丝阴极。研究了两种不同类型的排列纳米丝阵列:第一种是在极低温度(T<100/spl℃)下在硅片上电沉积成纳米孔模板的金属纳米线;第二，利用催化等离子体增强化学气相沉积法生长碳纳米管/纳米纤维(CNs)。介绍了这两种阴极的制备工艺和场发射性能。目前，用CN阴极获得了最好的效果。5.8 /spl mu/m高和50 nm直径的cnns阵列几何增强因子(h/r)为240/spl + usmn/7.5%。此外，使用扫描阳极场发射显微镜测量了每个发射极接近100 /spl mu/A的电流。由于这些特性，0.5 /spl倍/ 0.5 mm/sup 2/阵列在直流模式下发出2 mA电流，对应于0.8 a /cm/sup 2/。在未来的电信应用中，将讨论在30 GHz下提供10至50 W的微波三极管中使用这些冷阴极。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Technical Digest of the 17th International Vacuum Nanoelectronics Conference (IEEE Cat. No.04TH8737)

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