Noble Metal/W(111) Single-Atom Tips and Their Field Electron and Ion Emission Characteristics

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概要

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• We have developed a simple, reliable and reproducible method for preparing single-atom tips. With electrochemical techniques, a very small amount of a noble metal is plated on the surface of a clean W$\langle 111\rangle$ tip. Upon annealing the tip at an appropriate temperature in vacuum, a three-sided {211} pyramid with a single-atom sharpness is formed spontaneously at the tip apex by adsorbate-induced faceting. This tip is both thermally and chemically stable, and can be regenerated several ten times when accidentally damaged. We use a field ion microscope to examine the atomic structure of the tip apex layer by layer and characterize the corresponding electron emission in the field emission mode. Some properties of Ne+ ions emitted from a single-atom tip are also measured, indicating a high brightness and a small extension angle. Many desirable features make the single-atom tips very promising for future particle beam applications in nanoscience and nanotechnology.

• 2006-11-15

著者

• Tsong Tien

  Institute Of Physics Academia Sinica

• Fu Tsu-yi

  Department Of Physics National Taiwan Normal University

• Hwang Ing-shouh

  Institute Of Physics Academia Sinica Nankang

• Lin Yu-chun

  Department Of Pediatric Cardiology Kaohsiung Chang Gung Memorial Hospital And Chang Gung University College Of Medicine

• Hwang Ing-Shouh

  Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, R.O.C.

• Lin Yu-Chun

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan, R.O.C.

• Kuo Hong-Shi

  Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, R.O.C.

• Fu Tsu-Yi

  Department of Physics, National Taiwan Normal University, Taipei, Taiwan, R.O.C.

• Chang Che-Cheng

  Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, R.O.C.

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