Structural modification in proton-irradiated highly-oriented pyrolytic graphite

Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We have made a comprehensive study on the structural changes in highly-oriented pyrolytic graphite (HOPG) samples irradiated with 2.25-MeV proton beams. X-ray photoelectron spectroscopy showed a surface polishing effect and a graphite-to-diamond surface structural transformation, followed by regraphitization of the diamond-like surface as the proton irradiation dose was increased from 10 15 ions/cm 2 to 2 × 10 17 ions/cm 2. While the surface showed prominent changes at relatively small irradiation doses, the bulk region of the HOPG, as probed by Raman spectroscopy, manifested creation of defects only at the maximum dose employed, for which ferromagnetism takes place.

Original languageEnglish
Pages (from-to)2468-2471
Number of pages4
JournalJournal of the Korean Physical Society
Issue number6
Publication statusPublished - 2009 Jun


  • Highly-oriented pyrolytic graphite
  • Proton irradiation
  • Surface transformation
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • General Physics and Astronomy


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