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

doi:10.1117/12.877531

21 February 2011 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

Author Affiliations +

Proceedings Volume 7921, Laser-based Micro- and Nanopackaging and Assembly V; 79210E (2011) https://doi.org/10.1117/12.877531
Event: SPIE LASE, 2011, San Francisco, California, United States

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 CH2-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.

Citation Download Citation

Z. Q. Xie, Y. S. Zhou, X. N. He, Y. Gao, J. B. Park, T. Guillemet, and Y. F. Lu "Laser-assisted synthesis of diamond crystals in open air through vibrational excitation of precursor molecules", Proc. SPIE 7921, Laser-based Micro- and Nanopackaging and Assembly V, 79210E (21 February 2011); https://doi.org/10.1117/12.877531

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