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作为气场离子源发射体的单原子尖锐铱尖端。

A single-atom sharp iridium tip as an emitter of gas field ion sources.

作者信息

Kuo Hong-Shi, Hwang Ing-Shouh, Fu Tsu-Yi, Hwang Ying-Siang, Lu Yi-Hsien, Lin Chun-Yueh, Hou Jin-Long, Tsong Tien T

机构信息

Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.

出版信息

Nanotechnology. 2009 Aug 19;20(33):335701. doi: 10.1088/0957-4484/20/33/335701. Epub 2009 Jul 28.

DOI:10.1088/0957-4484/20/33/335701
PMID:19636091
Abstract

We report a reliable method for preparing a pure Ir single-atom tip by thermal treatment in oxygen. The atomic structure of the tip apex and its ion emission characteristics are investigated with field ion microscopy. We have shown that the Ir single-atom tip can be a good field ion emitter, capable of emitting a variety of gas ion beams, such as He+, H2+, N2+, and O2+, with high brightness and stability. In addition, this tip can easily be maintained and regenerated in vacuum, ensuring it has sufficient lifetime for practical applications.

摘要

我们报道了一种通过在氧气中进行热处理来制备纯铱单原子尖端的可靠方法。用场离子显微镜研究了尖端顶点的原子结构及其离子发射特性。我们已经表明，铱单原子尖端可以是一种良好的场离子发射体，能够以高亮度和稳定性发射各种气体离子束，如He +、H2 +、N2 +和O2 +。此外，这种尖端在真空中易于维护和再生，确保其具有足够的使用寿命以用于实际应用。

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