锥形碳纳米管束的场发射

Technical Digest of the 17th International Vacuum Nanoelectronics Conference (IEEE Cat. No.04TH8737) Pub Date : 2004-07-11 DOI:10.1116/1.1885009

H. Busta, Z. Toit, J. Montgomery, A. Feinerman

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引用次数: 5

摘要

碳纳米管被紧密地组装在一起，使得它们的间距小于它们的高度，并且由于静电屏蔽而减弱了碳纳米管顶端的场增强效应。捆扎是通过将管嵌入PCVD二氧化硅中，然后进行HF蚀刻，水冲洗和氮干燥来实现的。发射测量在真空系统中进行，压力为4 /spl倍/ 10/sup -9/ Torr。在室温、120 /spl°C和170 /spl°C下获得了电流-电压特性。在直径为0.5 mm的钨阳极上，获得了/sup 2/0 mA/cm/sup 2/的宏观电流密度。导通场约为15v //spl mu/m。

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Field emission from teepee-shaped carbon nanotube bundles

Carbon nanotubes were fabricated close together so that their separation is smaller than their height and field enhancement effects at the apexes of the tubes are diminished due to electrostatic shielding. Bundling was achieved by embedding the tubes into a PCVD silicon dioxide, followed by HF etching, water rinsing, and nitrogen drying. Emission measurements were performed in a vacuum system at a pressure of 4 /spl times/ 10/sup -9/ Torr. Current-voltage characteristics were obtained at room temperature, 120 /spl deg/C and 170 /spl deg/C. Macroscopic current densities of /sup 2/0 mA/cm/sup 2/ were obtained with a 0.5 mm diameter tungsten anode. The turn-on fields are about 15 V//spl mu/m.

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

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