Nanoparticle formation from supersaturated carbon vapor generates by laser-photolysis of carbon suboxide
In: Nonequilibrium Processes, Vol. 2: Plasma, Aerosols and Atmospheric Pollution / Roy, G.D.; Frolov, S.M.; Starik, A.M. (Hrsg.)
Moscow: Toros Press (2005), S. 162-172
Buchaufsatz / Kapitel / Fach: Maschinenbau
Carbon nanoparticles were synthesized from the supersaturated carbon vapor generated in the course of ArF-laser photolysis of carbon suboxide (C3O2). The process of carbon nanoparticle growth was observed by time-resolved laser-induced incandescence (TR-LII) and final particles were analyzed by transmission electron microscopy (TEM). It was found that the particles grow up to the final size of 4-12 nm within 0.02-1 ms. The rate of particle growth and their final size depend on pressure, carbon atom concentration, and bath gas composition. The comparison between the LII- and TEM-based particle sizes yields the information on the thermal energy accommodation coefficients for He, Ar, CO, and C3O2 molecules on carbon particles. A simple model of carbon vapor condensation is proposed.