Atomic structure and electronic properties of single-walled carbon nanotubes
Atomic structure and electronic properties of single-walled carbon nanotubes
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DOI：
10.1038/34145
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发表时间：
1998-01-01
期刊：
影响因子：
64.8
通讯作者：
Lieber, CM
中科院分区：
文献类型：
--
作者：
Odom, TW;Huang, JL;Lieber, CM
碳纳米管(1)被预测为金属或半导体，这取决于它们的直径和石墨环在其壁上排列的螺旋度（2-5）。扫描隧道显微镜（STM）提供了探测这一预测的潜力，因为它可以同时解析原子结构和状态的电子密度。先前的多壁纳米管（6-9）和单壁纳米管（10）的STM研究已经提供了不同结构和依赖于直径的电子性质的迹象，但没有揭示结构和电子性质之间的任何明确关系。在这里，我们报告了STM测量的原子结构和电子性质的SWNTs。我们能够解析出壁的六边形环结构，并表明电子性质确实取决于直径和螺旋度。我们发现SWNT样品表现出许多不同的结构，没有一个物种占主导地位。
Carbon nanotubes(1) are predicted to be metallic or semiconducting depending on their diameter and the helicity of the arrangement of graphitic rings in their walls(2-5). Scanning tunnelling microscopy (STM) offers the potential to probe this prediction, as it can resolve simultaneously both atomic structure and the electronic density of states. Previous STM studies of multi-walled nanotubes(6-9) and single-walled nanotubes (SWNTs)(10) have provided indications of differing structures and diameter-dependent electronic properties, but have not revealed any explicit relationship between structure and electronic properties, Here we report STM measurements of the atomic structure and electronic properties of SWNTs. We are able to resolve the hexagonal-ring structure of the walls, and show that the electronic properties do indeed depend on diameter and helicity. We find that the SWNT samples exhibit many different structures, with no one species dominating.