Laser-assisted synthesis of diamond crystals in open air through vibrational excitation of precursor molecules

Z. Q. Xie, Y. S. Zhou, X. N. He, Y. Gao, J. B. Park, T. Guillemet, Y. F. Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fast growth of diamond crystals in open air was achieved by laser-assisted combustion synthesis through vibrational excitation of precursor molecules. A wavelength-tunable CO2 laser (spectrum range from 9.2 to 10.9 μm) was used for the vibrational excitation in synthesis of diamond crystals. A pre-mixed C2H4/C2H2/O2 gas mixture was used as precursors. Through resonant excitation of the CH 2-wagging mode of ethylene (C2H4) molecules using the CO2 laser tuned at 10.532 μm, high-quality diamond crystals were grown on silicon substrates with a high growth rate of ∼139 μm/hr. Diamond crystals with a length up to 5 mm and a diameter of 1 mm were grown in 36 hours. Sharp Raman peaks at 1332 cm-1 with full width at half maximum (FWHM) values around 4.5 cm-1 and distinct X-ray diffraction spectra demonstrated the high quality of the diamond crystals. The effects of the resonant excitation of precursor molecules by the CO2 laser were investigated using optical emission spectroscopy.

Original languageEnglish (US)
Title of host publicationLaser-Based Micro- and Nanopackaging and Assembly V
DOIs
Publication statusPublished - Mar 31 2011
EventLaser-Based Micro- and Nanopackaging and Assembly V - San Francisco, CA, United States
Duration: Jan 25 2011Jan 27 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7921
ISSN (Print)0277-786X

Conference

ConferenceLaser-Based Micro- and Nanopackaging and Assembly V
CountryUnited States
CitySan Francisco, CA
Period1/25/111/27/11

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Keywords

  • Diamond crystal
  • Energy coupling
  • Ethylene molecule
  • Resonant excitation
  • Vibrational mode
  • Wavelength-tunable CO laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Xie, Z. Q., Zhou, Y. S., He, X. N., Gao, Y., Park, J. B., Guillemet, T., & Lu, Y. F. (2011). Laser-assisted synthesis of diamond crystals in open air through vibrational excitation of precursor molecules. In Laser-Based Micro- and Nanopackaging and Assembly V [79210E] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7921). https://doi.org/10.1117/12.877531