图形化的衬底电极改善碳纳米管的场发射特性

Improved field emission characteristics of carbon nanotubes by patterned substrate electrode

用电泳法将碳纳米管分别淀积到图形的和平面的ITO(铟锡氧化物)电极上作为场发射阴极并比较性的研究了它们的场发射特性。实验结果显示,相对于平面的衬底电极,斑条的ITO电极能够有效的改善碳纳米管的场发射特性。通过电场的数值计算,场发射特性的改善起源于斑条的ITO电极自身的表面电场增强引起了碳纳米管表面电场的两级放大。采用图形化衬底电极去制备碳纳米管阴极是改善碳纳米管场发射特性的一个简单、有效途径。

Carbon nanotubes （CNTs） were deposited into planar and patterned indium tin oxide glass substrate with electrophoretic method as field emission cathode and theirs field emission characteristics were also investigated. Experimental results indicated that the field emission characteristic of the patterned CNT cathode was improved as compare with the planar CNT cathode. By calculating the electric field distribution, it was found that surface electric field of the patterned ITO electrode had an electric field enhancement resulting from the edge field effect. The improved field emission characteristic was attributed to two-grade field enhancement in surface of CNTs. In the fabrication of CNTs cathlode, it is an available way to enhance electron emission form CNTs that use of the patterned substrate electrode.