HELICAL MICROTUBULES OF GRAPHITIC CARBON
HELICAL MICROTUBULES OF GRAPHITIC CARBON
复制标题
DOI：
10.1038/354056a0
复制
发表时间：
1991-11-07
期刊：
影响因子：
64.8
通讯作者：
IIJIMA, S
中科院分区：
文献类型：
--
作者：
IIJIMA, S
C60和其他富勒烯形式的分子碳结构的合成激发了人们对石墨碳片可接近结构的强烈兴趣。本文报道了一种由针状管组成的新型有限碳结构的制备。使用电弧放电蒸发法生产类似于用于富勒烯合成的方法，针生长在用于电弧放电的电极的负端。电子显微镜显示，每根针由石墨薄片组成的同轴管组成，数量从2到50不等。在每根管子上，碳原子六边形围绕针轴呈螺旋状排列。螺旋螺距在针与针之间和一根针与一根管之间都是不同的。看来这种螺旋结构可能有助于生长过程。这些针状结构的直径从几纳米到几十纳米不等，这表明碳结构的工程设计在比富勒烯大得多的尺度上是可能的。
THE synthesis of molecular carbon structures in the form of C60 and other fullerenes 1 has stimulated intense interest in the structures accessible to graphitic carbon sheets. Here I report the preparation of a new type of finite carbon structure consisting of needle-like tubes. Produced using an arc-discharge evaporation method similar to that used for fullerene synthesis, the needles grow at the negative end of the electrode used for the arc discharge. Electron microscopy reveals that each needle comprises coaxial tubes of graphitic sheets, ranging in number from 2 up to about 50. On each tube the carbon-atom hexagons are arranged in a helical fashion about the needle axis. The helical pitch varies from needle to needle and from tube to tube within a single needle. It appears that this helical structure may aid the growth process. The formation of these needles, ranging from a few to a few tens of nanometres in diameter, suggests that engineering of carbon structures should be possible on scales considerably greater than those relevant to the fullerenes.