THINNING AND OPENING OF CARBON NANOTUBES BY OXIDATION USING CARBON-DIOXIDE
THINNING AND OPENING OF CARBON NANOTUBES BY OXIDATION USING CARBON-DIOXIDE
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DOI：
10.1038/362520a0
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发表时间：
1993-04-08
期刊：
影响因子：
64.8
通讯作者：
GREEN, MLH
中科院分区：
文献类型：
--
作者：
TSANG, SC;HARRIS, PJF;GREEN, MLH
碳纳米管的发现1和本体合成2引起了人们的极大兴趣。有人建议，这些结构可能具有有用的电子3-5和机械6特性，并且可以通过将外来材料引入纳米管来修改这些特性。但管子的末端总是加盖的。 Ajayan 和 Iijima7 通过在铅和氧气存在的情况下加热，成功地将熔融材料（铅或其化合物之一）吸入管中；研究样本中只有不到 1% 的试管可以通过这种方式填充。在这里，我们报告说，在二氧化碳气体中加热会导致管盖部分或完全破坏，并剥离外层以生产更薄的管。在某些情况下，我们将管的末端减薄为单层。打开的管可以被视为吸附其他分子的纳米级试管，这种受控的细化方法可以允许研究单管的特性。
THE discovery1 and bulk synthesis2 of carbon nanotubes has stimulated great interest. It has been suggested that these structures may have useful electronic3-5 and mechanical6 properties, and these might be modified by introducing foreign materials into the nanotubes. But the tubes are invariably capped at the ends. Ajayan and Iijima7 have succeeded in drawing molten material (lead or one of its compounds) into the tubes by heating them in the presence of lead and oxygen; less than 1% of the tubes in the sample studied could be filled in this way. Here we report that heating in carbon dioxide gas can result in the partial or complete destruction of the tube caps and stripping of the outer layers to produce thinner tubes. In some cases, we have thinned the extremity of tubes to a single layer. The opened tubes can be regarded as nanoscale test-tubes for adsorption of other molecules, and this controlled method of thinning may allow studies of the properties of single tubes.