Formation of carbon capsules from an amorphous carbon film by ga and Ni/Co catalysts in a transmission electron microscope

Cheng Yu Wang, Yen Chih Chen, Wen Huei Chu, Chuan Pu Liu, C. B. Boothroyd

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Direct conversion of an amorphous carbon (C) film to capsules by gallium (Ga), and nickel and cobalt (NiCo) alloy particles upon heating is investigated in situ by transmission electron microscopy (TEM). Capsules are catalyzed in an NH 3 atmosphere when the temperature is raised to 1050 °C. High resolution TEM reveals that graphene flakes initially nucleate at the surface of the catalysts, then segregate and transform into faceted multi-shell capsules upon continued heating. The solubility of carbon in the NiCo alloy particles can be differentiated from the solubility of carbon in Ga particles by the thickness of the walls. The C/Ga binary phase in nanoparticles is discussed regarding the formation of thin-walled carbon capsules.

Original languageEnglish
Pages (from-to)1388-1394
Number of pages7
JournalJournal of Materials Research
Volume24
Issue number4
DOIs
Publication statusPublished - 2009 Apr

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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