Artifact Diamond Characterization

Abstract

Three CVD diamond films were produced in a hot-filament reactor using acetone as the carbon source. The acetone was enriched 33% at the methyl carbon, and the total gas-phase concentrations were 5.3%, 6.4%, and 7.4%. Static solid- state NMR measurements of hydrogen concentration, sp2/sp3 carbon bonding environments, and carbon-13 spin-lattice relaxation have been made on these films while they remain intact on their substrates. The hydrogen concentration was found to be below 1 at. % in each film. Increasing sp2 content is found with increasing gas-phase carbon concentration. Ongoing measurements are aimed at understanding the sp3 region of the NMR spectra and its relationship to Raman measurements of these films. An increased concentration of defect centers decreased the spin-lattice relaxation time constant from 18 s to 1 s as the pas- phase carbon concentration increased.

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Document Details

Document Type
Technical Report
Publication Date
Jan 22, 1991
Accession Number
ADA231555

Entities

People

  • Karen K. Gleason

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Artifacts
  • Diamond Films
  • Environment
  • Filaments
  • Films
  • Hydrogen
  • Massachusetts
  • Measurement
  • Military Research
  • Relaxation Time
  • Spectra
  • Substrates

Readers

  • Molecular Photonics/Laser Physics
  • Organic Chemistry
  • Thin Film Deposition Science.