磁场辅助热处理金属化碳纳米管场发射性能

利用化学镀方法对多壁碳纳米管(multi-walled carbon nanotubes,MWNTs)表面金属化镀镍(MWNTs/Ni),采用丝网印刷制备MWNTs/Ni场发射阴极,并在磁场辅助下热处理所得阴极,研究磁场辅助热处理对MWNTs/Ni阴极的场发射性能的影响,经300mT磁场辅助热处理的MWNTs/Ni的场发射阴极开启场强约为0.80V·μm~(-1),场增强因子β约为16068,对单根MWNTs/Ni在磁场中的受力情况进行建模分析,实验结果表明:磁场辅助热处理有助于提高MWNTs/Ni在阴极表面的直立分布,提高了MWNTs/Ni的场发射性能。

Effect of magnetic field assisted heat-treatment on field emission properties of metalized multi-walled carbon nanotubes cathodes

The effect of magnetic field assisted heat-treatment on the field emission properties of metalized multi-walled carbon nanotubes (MWNTs) is investigated. The metalized MWNTs are prepared via an electroless plating method, and then the MWNTs/Ni cathodes are fabricated by screen printing. The morphology and composition of MWNTs/Ni were studied by transmission electron microscopy and energy dispersive X-ray detector, and the difference between MWNTs/Ni cathodes heat-treated with or without magnetic field was observed by scanning electron microscopy. The force of a single MWNT coated with Ni was simulated, and the results demonstrate that the magnetic field force could induce the rotation of MWNTs/Ni during magnetic field assisted heat-treatment. The field emission characteristics show that the MWNTs/Ni cathodes heat-treated with magnetic field has a low turn-on field of 0.80 V·μm^-1 and high field enhancement factor of 16068, which are attributed to the embossment of MWNTs/Ni from substrates under the magnetic field.
Keywords： field emission metalized multi-walled carbon nanotubes magnetic field electroless plating