Product Code: ICAL07_M801
Laser-Assisted Diamond Deposition on Copper Substrated using Combustion-Flame Method
Authors:
H. Ling, University of Nebraska - Lincoln; Lincoln NE USA
M. Zhao, University of Nebraska - Lincoln; Lincoln NE USA
Yaoxuan Han, University of Nebraska - Lincoln; Lincoln NE USA
Yongfeng Lu, University of Nebraska - Lincoln; Lincoln NE USA
J. Sun, University of Nebraska - Lincoln; Lincoln NE USA
T. Gebre, University of Nebraska - Lincoln; Lincoln NE USA
Presented at ICALEO 2007
Diamond was deposited on metal substrates (Cu, Al, and Fe) in open atmosphere using a C2H2/O2 combustion flame. A continuous CO2 laser was used to irradiate the substrates at initial deposition stages to heat the substrate surfaces to high deposition temperatures in less than 1 min. As a consequence, the diamond nucleation rate and deposition speed were increased. Diamond films up to several microns were obtained on Cu substrates in 5 min. When operated at pulsed mode, the laser was found to be useful in melting substrate surfaces and embedding diamond crystals in the melting layers, which potentially improves film adhesion to the substrates. Graphite and diamond powders were used as seeds to enhance the diamond nucleation. It was found that the seeding effect of diamond powders was obvious at all times, while that of graphite powders showed different results at different deposition temperatures. Scanning electron microscopy, energy dispersive X-ray analysis, and Raman spectroscopy were used to characterize the deposited diamond films. A mechanism for diamond nucleation on the metal substrates under different deposition parameters (temperature, seeding, and laser irradiation) was proposed.
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