SELF ASSEMBLED ORGANIC NANOCRYSTAL SUPERLATTICES

摘要

A process for the preparation of a self assembled superlattice thin film comprising: (i) combining one or more functional organic material and one or more surface active material in a compressed CO2 phase, where they interact to form an aggregated system having a continuous compressed CO2 phase and a plurality of aggregates comprising surfactant and functional material molecules of average diameter less than 50 nanometers dispersed therein; (ii) rapidly depressurizing the compressed phase thereby precipitating the dispersed materials in the form of composite organic nanocrystals of average diameter less than 50 nanometers, and (iii) depositing the organic nanocrystals on a substrate surface, wherein the organic nanocrystals form a thin film having an ionic content of less than 0.001 M in equivalent sodium chloride concentration, and the thin film exhibits a long range periodicity in the arrangement of the organic nanocrystals in a self assembled superlattice structure.