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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


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.

Original languageEnglish
Article number335701
Issue number33
Publication statusPublished - 2009 Aug 19

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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