Finely controlled size-selective precipitation and separation of CdSe/ZnS semiconductor nanocrystals using CO2-gas-expanded liquids.

摘要: A technique was developed to size-selectively separate polydisperse dispersions of CdSe/ZnS nanocrystals into distinct color fractions using only the tunable solvent properties CO2-expanded hexane. This size-selective precipitation semiconductor nanoparticles is achieved by finely tuning strength CO2/hexane medium simply adjusting applied CO2 pressure. These subtle changes affect balance between osmotic repulsive and van der Waals attractive forces, thereby allowing fractionation multiple narrow size populations.