Enhanced diamond nucleation on copper substrates by graphite seeding and CO 2 laser irradiation

Y. X. Han, H. Ling, J. Sun, M. Zhao, T. Gebre, Y. F. Lu

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Diamond nucleation on copper (Cu) substrates was investigated by graphite seeding and CO 2 laser irradiation at initial stages of the combustion-flame deposition. A graphite aerosol spray was used to generate a thin layer of graphite powders (less than 1 μm) on Cu substrates. The graphite-seeded Cu substrates were then heated by a continuous CO 2 laser to about 750 °C within 1 min. It was found that diamond nucleation density after this treatment was more than three times as much as that on the virgin Cu substrates. As a consequence, diamond films up to 4 μm were obtained in 5 min. The enhancement of diamond nucleation on the graphite-seeded Cu substrates was attributed to the formation of defects and edges during the etching of the seeding graphite layers by the OH radicals in the flame. The defects and edges served as nucleation sites for diamond formation. The function of the CO 2 laser was to rapidly heat the deposition areas to create a favorable temperature for diamond nucleation and growth.

Original languageEnglish (US)
Pages (from-to)2054-2058
Number of pages5
JournalApplied Surface Science
Volume254
Issue number7
DOIs
Publication statusPublished - Jan 30 2008

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Keywords

  • Combustion flame
  • Copper
  • Diamond films
  • Laser irradiation
  • Nucleation

ASJC Scopus subject areas

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

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