Product Code: ICAL06_M104

Laser-assisted Combustion-flame Synthesis of Diamond Films
Authors:
Y.X. Han, University of Nebraska-Lincoln; Lincoln NE USA
H. Ling, University of Nebraska; Lincoln NE USA
Yongfeng Lu, University of Nebraska-Lincoln; Lincoln NE USA
Presented at ICALEO 2006

Diamond and diamond-like carbon (DLC) films were synthesized on tungsten carbide substrates in open atmosphere using a C2H2/O2 combustion flame with a gas ratio (C2H2/O2) of 0.9-1.0. Before and during the synthesizing process, a KrF excimer laser with a pulse width of 23 ns and a wavelength of 248 nm was used to illuminate the reaction area. The surface morphology and structure of the deposited films were studied by scanning electron microscopy (SEM) and Raman spectroscopy, respectively. From the SEM images diamond crystals with {100} and {111} facets could be observed. The Raman spectra showed an obvious diamond peak at 1332 cm-1 along with a low-intensity D band and a low-wave-number G band, which indicates high sp3-bonded structures in the deposited films. The effects of laser irradiation in the synthesizing process will be discussed.