Synthesis of nitrogen-doped diamond films using vibrational excitation of ammonia molecules in laser-assisted combustion flames

L. S. Fan, Z. Q. Xie, J. B. Park, X. N. He, Y. S. Zhou, L. Jiang, Y. F. Lu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Nitrogen-doped diamond was synthesized in open air using laser-assisted combustion flame method. A wavelength-tunable CO 2 laser was used to resonantly excite the vibration modes of ammonia molecules, which were added into the diamond forming combustion flame. The wavelength of the CO 2 laser was tuned to match frequencies of the NH wagging mode of the ammonia molecules. High efficiency energy coupling was achieved at laser wavelengths of 9.219, 10.35, and 10.719 μm, which are related to a rotational-vibrational transition (1084.63 cm -1), and splitting of the NH wagging mode ( 2, 932.51 cm -1 and 2-, 968.32 cm -1). Vibrational excitations of the ammonia molecules under these wavelengths actively intervenes the reaction courses, which steers the chemical reaction in the combustion flame and eventually promotes nitrogen concentration in the deposited diamond films. Concentration of the doped nitrogen atoms reaches up to 1.5 × 10 20 atomscm 3 in the diamond films deposited with a laser wavelength of 9.219 m. Optical emission spectroscopy and mass spectrometry were used to study the evolution of chemical reactions with and without laser excitations.

Original languageEnglish (US)
Article number022001
JournalJournal of Laser Applications
Volume24
Issue number2
DOIs
StatePublished - May 2012

Keywords

  • N-doped diamond
  • laser-assisted combustion flame
  • resonant laser excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Instrumentation

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