Modification of highly oriented pyrolytic graphite (HOPG) surfaces with highly charged ion (HCI) irradiation

Y. Koguchi, T. Meguro, A. Hida, H. Takai, K. Maeda, Y. Yamamoto, Y. Aoyagi

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


Slow Ar8+ irradiation and the following electron injection creates a non-conductive area to a depth of a few nanometers on a highly oriented pyrolytic graphite surface (HOPG). The annealing of the sample in a hydrogen atmosphere stabilizes the Ar8+ impact area, which results in the field emission from the impact region. The property of the field emission is similar to that of diamond-like carbon (DLC), suggesting the possibility that sp3 hybridization occurs at the Ar8+ impact region. The work function estimated from the Fowler-Nordheim plot is much lower than non-treated HOPG and similar to a hydrogen-terminated DLC film.

Original languageEnglish
Pages (from-to)202-205
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - May 2003
Event13th International conference on Ion beam modification of Mate - Kobe, Japan
Duration: 1 Sep 20026 Sep 2002


  • Field emission
  • Fowler-Nordheim plot
  • Graphite
  • Highly charged ion
  • Material processing
  • Nano-structure


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