Field electron emission from molybdenum platinum alloy tips

Megumi Nakajima, Wataru Ito, Boklae Cho, Chuhei Oshima

Research output: Contribution to journalArticle

Abstract

Through annealing at 900-1000 K under ultrahigh vacuum, a nanopyramid terminated by a single atom was spontaneously grown on a Mo-Pt alloy tip surface. We observed single-atom termination of the pyramid by field ion microscopy and detected its characteristic features by field emission spectroscopy. Mo95%-Pt5% alloy tips were fabricated into single-atom terminated pyramids at a higher success rate than were Mo99%-Pt1% alloy tips, strongly suggesting that Pt segregation at the tip surface was crucial for single-atom termination. In addition, we found the Mo95%-Pt5% alloy tips to be self-repairing and demountable, which are common properties in single-atom termination of body-centered cubic metal tips covered with a face-centered cubic material.

Original languageEnglish
Pages (from-to)644-646
Number of pages3
JournalSurface and Interface Analysis
Volume44
Issue number6
DOIs
Publication statusPublished - 2012 Jun

Keywords

  • FEM
  • FES
  • FIM
  • molybdenum platinum (Mo-Pt) alloy
  • single-atom termination

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Chemistry
  • Surfaces, Coatings and Films

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