由非晶态碳制备了一类新型纳米碳绳,因其卷绕形状、多层叠片和清晰可见的管壁,称之为纳米蛇型碳管(NCSTs).形貌观察表明其由直径约73nm的碳穹顶相叠而成,穹顶间距为0.34nm,蛇管长度可达0.2mm.其制备是将脱灰煤和纳米硅的混合物通过温度为3000～4500K的Ar/H2等离子体炬,在反应产物中可以观察到大量的NCSTs.文中对该新型结构的形成机理和纳米硅微粒的催化作用进行了讨论,分析了NCSTs的化学组成和电子结构,并对其力学、电学、化学等性能和应用前景进行了预测.
A kind of carbon nano-filaments with novel structure was made from amorphous carbon. The nanofilaments are named nano carbon surpentine tubes (NCSTs) for their curved shape, multiple layers of flakes, and clearly visible tube walls. Its ultrafine morphology shows that the shell structure is consisted of laminated carbon domes of the diameter ～ 73nm, with the interval between domes of 0.34nm. The length of NCSTs can be as long as 0. 2mm. The preparation of NCSTs was carried out by transferring the mixture of deashed coal and nano silicon particles into an Ar/H2 plasma jet of temperature 3000 ～ 4500K. The microscopic observation of the reaction residues shows the existence of large amount of NCSTs. In this paper the synthesis technology and the formation mechanism of this novel-structured carbon material and the catalysis mechanism of silicon nano particles were investigated, the ultrafine structure,chemical composition and electronic structure of NCSTs were analyzed. Finally, the mechanics, chemistry, conductivity and field emission of NCSTs were theoretically discussed. Moreover, its potential application and prospects were also previewed.
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