PREPARATION OF SIZE-CLASSIFIED PBS NANOPARTICLES IN THE GAS-PHASE

We report on the synthesis of size-classified PbS nanocrystals by diff erential mobility analysis of a polydisperse aerosol formed by nucleat ion and aggregation processes in a furnace reactor. The sublimation te mperature employed is below the stoichiometric evaporation temperature , thus enabling direct and simple synthesis by sublimation. The irregu larly shaped and amorphous agglomerate particles ale then sintered in a second furnace, resulting in the formation of monocrystalline and qu asispherical particles with sizes adjustable between 3 and 20 nm and a standard deviation of 1.13. (C) 1998 American Institute of Physics.