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Study of Nano-fabrication and Tunneling Phenomenon of Nanowires at Tip-Surface studied by UHV electron microscoopy

特高压电子显微镜研究纳米线尖端表面的纳米加工和隧道现象

基本信息

批准号：
09304036
负责人：
TAKAYANAGI Kunio
金额：
$ 22.46万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

We made metal nanowires in ultra-high-vacuum electron microscope to study the structues of nanowires. In addition, we made computer simulation of the high-resolution electron microscope images of metal nanowires. Also we investigated relationship between the structure and conductance of the nanowires. We found for gold nanowires that the gold nanowires exhibit specific structure that is different from the crystaline structure. The new structures had co-axial tube structure, similar to carbon nanotubes. The gold tube, however, consists of the triangular network, dissimilar to graphite sheet of the carbon nanotubes. The structure of gold nanowires, then, expected to have the magic number that determine the stable structure of the nanowire. We found the magic number of the outer-most tube is 7, 11, 13, 14 for the fine nanotubes. The finest nanowire is a single atomic row, of a linear chain of atoms. We found that gold atoms could form a suspended single row chain, with a large bond length of 4A. We simulated the image of gold chain, and verified that the chain has no glue atoms between the 4A separated gold atoms.In summary, we found gold nanowires have co-axial tube structure, and a single chain has even 4A bond length before its break. Conductance of these specific nanowires, however, have remained to be investigated in future.

为了研究纳米线的结构，我们在超高真空电子显微镜下制作了金属纳米线。此外，我们还对金属纳米线的高分辨率电子显微镜图像进行了计算机模拟。我们还研究了纳米线的结构与电导之间的关系。我们发现，对于金纳米线，金纳米线表现出不同于晶体结构的特殊结构。新结构具有与碳纳米管相似的同轴管状结构。然而，金管由三角形网络组成，与碳纳米管的石墨片不同。因此，金纳米线的结构有望具有决定纳米线稳定结构的魔术数字。我们发现，对于精细的纳米管，最外层的管子的幻数是7，11，13，14。最好的纳米线是由一条线性原子链组成的单原子行。我们发现金原子可以形成一个悬浮的单排链，具有4A的大键长。我们模拟了金链的图像，并验证了在分离的4A金原子之间没有胶原子，综上所述，我们发现金纳米线具有同轴管状结构，并且单链在断裂之前甚至有4A键长。然而，这些特定纳米线的电导仍有待于未来的研究。