Carbon dioxide laser synthesis from gaseous precursors has been successfully applied to produce nanosized Al2O3particles. Trimethylaluminum [Al(CH3)3] and nitrous-oxide (N2O) were used as gas phase reactants. Ethylene (C2H4) was added as sensitizer gas. The as-synthesized powder particles showed considerable carbon contamination and an amorphouslike structure. After thermal treatment at 1200-1400°C, the powder transformed to hexagonal α-Al2O3with very low carbon contamination, confirmed by x-ray diffraction, x-ray photoelectron spectroscopy, and chemical analysis. The thermally treated powder was composed of spherical single-crystal nanoparticles with a mean size 〈D〉 of 15-20 nm, as determined by x-ray diffraction, electron microscopy, and Brunauer-Emmett-Teller specific surface measurements. The laser synthesized Al2O3particles are suitable dispersoids for intermetallic alloy technology.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
Borsella, E., Botti, S., Giorgi, R., Martelli, S., Turtù, S., & Zappa, G. (1993). Laser-driven synthesis of nanocrystalline alumina powders from gas-phase precursors. Applied Physics Letters, 63(10), 1345 - 1347. https://doi.org/10.1063/1.109672