21 February 2011 Laser-assisted synthesis of diamond crystals in open air through vibrational excitation of precursor molecules
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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.
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Z. Q. Xie, Z. Q. Xie, Y. S. Zhou, Y. S. Zhou, X. N. He, X. N. He, Y. Gao, Y. Gao, J. B. Park, J. B. Park, T. Guillemet, T. Guillemet, Y. F. Lu, 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); doi: 10.1117/12.877531; https://doi.org/10.1117/12.877531
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