Electron emission properties of free-standing thin film

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI:10.1109/IVESC.2004.1414236

Ma Huizhong, Z. Lan, Z. Junjie, Du Yunhai, Yao Ning, Zhang Binglin

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Abstract

Summary form only given. A free-standing thin film was prepared by electrophoretic method. A polyimide film coated with Ti was used as a cathode and a stainless steel plate as an anode, respectively. The two electrodes were placed into a bath with solvent consisting of fine carbon nano-tube particles, Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O and isopropyl alcohol (IPA). Mixed solution was stirred for about 2-4 hours to assure the complete dissolution of Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O and the dispersion of carbon nano-tube particles. DC electric field was applied to the two electrodes. The anode voltage was about 100V. After 1-2 minutes, the carbon nano-tube particles were deposited on the polyimide film coated with Ti, and a free-standing film was prepared. The electron field emission properties of the prepared thin film were tested by a diode mechanism. The turn-on field of the thin film was about 2.96V//spl mu/m. The current density of the thin film was about 200/spl mu/A/cm/sup 2/ at an electric field of 5.9V//spl mu/m. The morphology and structure of the thin film were examined by scanning electron microscope (SEM) and Raman spectroscopy. The experimental results indicate that this film "could be a promising material applicable to cold cathodes.

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独立薄膜的电子发射特性

只提供摘要形式。采用电泳法制备了独立薄膜。用涂有Ti的聚酰亚胺薄膜作为阴极，用不锈钢板作为阳极。将两个电极置于由细碳纳米管颗粒、Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O和异丙醇(IPA)组成的溶剂浴中。混合溶液搅拌约2 ~ 4小时，以保证Mg(NO/sub 3/)/sub 2/ 6H/sub 2/O的完全溶解和碳纳米管颗粒的分散。在两个电极上施加直流电场。阳极电压约为100V。1 ~ 2分钟后，将碳纳米管颗粒沉积在涂有Ti的聚酰亚胺薄膜上，制成独立薄膜。利用二极管机制测试了薄膜的电子场发射性能。薄膜的导通场约为2.96V//spl mu/m。在5.9V//spl mu/m的电场下，薄膜的电流密度约为200/spl mu/A/cm/sup 2/。利用扫描电子显微镜(SEM)和拉曼光谱对薄膜的形貌和结构进行了表征。实验结果表明，该薄膜是一种很有前途的冷阴极材料。

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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IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)

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