Formation of carbon nanostructures containing single-crystalline cobalt carbides by ion irradiation method

Zhipeng Wang, Zamri Yusop, Pradip Ghosh, Yasuhiko Hayashi, Masaki Tanemura

Research output: Contribution to journalArticle

4 Citations (Scopus)


Carbon nanofibers (CNFs) with a diameter of 17 nm, and carbon nanoneedles (CNNs) with sharp tips have been synthesized on graphite substrates by ion irradiation of argon ions with the Co supplies rate of 1 and 3.4 nm/min, respectively. Energy dispersive X-ray spectrometry, combined with selected area electron diffraction patterns has been used to identify the chemical composition and crystallinity of these carbon nanostructures. The CNFs were found to be amorphous in nature, while the structures of the CNNs consisted of cubic CoCx, orthorhombic Co2C and Co3C depending on the cobalt content in the CNNs. The diameter of the carbide crystals was almost as large as the diameter of the CNN. Compared to the ion-induced nickel carbides and iron carbides, the formation of single-crystalline cobalt carbides might be due to the high temperature produced by the irradiation.

Original languageEnglish
Pages (from-to)3168-3173
Number of pages6
JournalApplied Surface Science
Issue number8
Publication statusPublished - Feb 1 2011
Externally publishedYes



  • Carbon nanofiber
  • Carbon nanoneedle
  • Ion irradiation
  • Single-crystallinity cobalt carbide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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