Crystal Growth & Design · 2010 · 32 citations · 25 references
Natural SciencesChemistryMaterials ScienceMaterials ChemistryOptical MaterialsSpectroscopyCrystal ChemistryCrystal GrowthLaser PhysicsLaser SpectroscopyOptical SpectroscopyRaman SpectroscopyCombustion SynthesisExcitationFull Width At Half MaximumOptical Emission SpectroscopyResonant CouplingResonant ExcitationSiliconX-ray Spectra
Fast growth of diamond crystals in open air was achieved by combustion synthesis with resonant laser energy coupling. A premixed C 2 H 4 /C 2 H 2 /O 2 gas mixture was used as precursors for growth of diamond crystals. Through the resonant excitation of the CH 2 wagging mode of the ethylene (C 2 H 4 ) molecules using a CO 2 laser tuned at 10.532 μm, high-quality diamond crystals were grown on silicon substrates with a high growth rate at ∼139 μm/h. Diamond crystals with a length up to 5 mm and a diameter of 1 mm were grown in 36 h. 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 laser energy coupling were investigated using optical emission spectroscopy.
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