Barium strontium oxide coated carbon nanotubes as field emitters
Barium strontium oxide coated carbon nanotubes as field emitters
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DOI：
10.1063/1.2719645
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发表时间：
2007-04
影响因子：
4
通讯作者：
F. Jin;Yan Liu;C. Day
中科院分区：
文献类型：
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作者：
F. Jin;Yan Liu;C. Day
报道了一种基于氧化碳纳米管（CNTs）的场致发射体结构。该发射器由表面带有碳纳米管的薄钨带和在碳纳米管上涂有一层薄的低功函数氧化钡层组成。这种氧化物涂层碳纳米管发射器的设计结合了碳纳米管的高场增强系数和发射性氧化物涂层的低功函数的优点。对发射体的场发射特性进行了表征。结果表明，CNTs的场增强系数为467，功函数为1.9eV。与未包覆CNTs相比，氧化包覆CNTs的场发射强度增加了2-3倍。在4.4V∕μm下，在0.012cm2的发射表面上获得了23.6μA的场发射电流。
The authors report a field emitter structure based on oxide coated carbon nanotubes (CNTs). This emitter consists of a thin tungsten ribbon with CNTs on the surface and a thin layer of low work function barium strontium oxide coating on the CNTs. This oxide coated CNT emitter was designed to combine the benefits of the high field enhancement factor from CNTs and the low work function from the emissive oxide coating. The field emission properties of the emitters were characterized. A field enhancement factor of 467 and a work function of 1.9eV were obtained for the oxide coated CNTs. Compared to the uncoated CNTs, the field emission from the oxide coated CNTs increased by a factor of 2–3. At 4.4V∕μm, the field emission current of 23.6μA was obtained from an emitting surface of 0.012cm2.