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以甲烷和二氧化硅纳米球为源,铁作催化剂,成功制备了长径比达200的碳化硅/二氧化硅核壳结构一维纳米线,分析了纳米线的合成机制,并研究了纳米线的场发射特性。研究结果表明,当施加的电场为5.5V/μm时,纳米线的场发射电流密度可达0.41mA/cm2,显示出良好的场发射特性。通过分析实验结果,认为纳米线具有良好场发射特性的原因有2个:一个是核壳结构纳米线的长径比比较大;另一个是核壳结构纳米线表面包覆的低电子亲和势的二氧化硅薄层抑制了表面缺陷发射。
The synthesis of one-dimensional nanowires with silicon carbide / silica core-shell structure with an aspect ratio up to 200 was successfully prepared using methane and silica nanospheres as the source and iron as catalyst. The synthesis mechanism of the nanowires was analyzed. Field emission characteristics of the line. The results show that when the applied electric field is 5.5V / μm, the field emission current density of nanowires reaches 0.41mA / cm2, which shows good field emission characteristics. By analyzing the experimental results, it is considered that there are two reasons that the nanowires have good field emission characteristics: one is that the aspect ratio of the core-shell nanowires is relatively large; and the other is the low electron affinity coated by the surface of the core-shell nanowires The thin layer of silica inhibits surface defect emission.