利用石英管型微波等离子体化学气相沉积装置,在Si基板上制备了具有纳米针状结构的碳膜.场发射特性测试表明,纳米针状结构碳膜具有良好的场发射特性,阈值电场为2.2 V/μm,外加电场为9 V/μm时,电流密度达到65 mA/cm2.利用统计效应修改了Fowler-Nordheim (F-N) 模型,成功地解释了在低电场区域的场发射机理.但是利用修改的F-N模型,不能解释高电场区域的电流密度的饱和现象,这将有待于进一步研究.
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