Shalaka A. Kamble, Soumen Karmakar, Somnath R. Bhopale, Sanket D. Jangale, Neha P. Gadke, Srikumar Ghorui, S. V. Bhoraskar, M. A. More, V. L. Mathe
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引用次数: 0
摘要
在此，我们报告了一项案例研究，在该研究中，我们看到了商用块状石墨在非正常大气条件下自发转化为 LaB6 装饰碳纳米管 (CNT)。原料石墨被用作填充有 LaB6 粉末的空心圆柱形阳极，并在纯氮气氛下的直流电弧等离子体反应器中被部分腐蚀。经等离子体处理的残余阳极在环境大气条件下持续数月后，出现了不寻常的自发变形，变成了绒毛状粉末。通过使用电子显微镜、拉曼光谱和 X 射线衍射，证实在生成的粉末中存在大量 LaB6 装饰的多壁 CNT。新合成的基于碳纳米管的大面积场发射器显示出良好的场发射特性，其转一电场较低，约为每微米 1.5 V，在每微米 3.24 V 的外加电场下，电流密度约为每平方厘米 1.17 mA。
LaB6 aided spontaneous conversion of bulk graphite into carbon nanotubes at normal atmospheric conditions
Herein, we report a case study in which we saw the spontaneous conversion of
commercial bulk graphite into LaB6 decorated carbon nanotubes (CNTs) under
normal atmospheric conditions. The feedstock graphite was used as a hollow
cylindrical anode filled with LaB6 powder and partially eroded in a DC
electric-arc plasma reactor in pure nitrogen atmosphere. An unusual and
spontaneous deformation of the plasma-treated residual anode into a fluffy
powder was seen to continue for months when left to ambient atmospheric
conditions. The existence of LaB6 decorated multi-walled CNTs at large quantity
was confirmed in the as-generated powder by using electron microscopy, Raman
spectroscopy and x-ray diffraction. The as-synthesized CNT-based large-area
field emitter showed promising field-emitting properties with a low turn-on
electric field of ~1.5 V per micrometer, and a current density of ~1.17 mA per
square cm at an applied electric field of 3.24 V per micrometer.
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