METHOD FOR PRODUCING CORE/SHELL NANOPARTICLES AND CORE/SHELL NANOPARTICLES

摘要

The present invention relates to a process for the continuous preparation of core-shell nanoparticles, comprising a core of a core material, preferably of a semiconductor material, and a shell of a shell material, preferably of a semiconductor material, wherein selected starting materials for the shell material are mixed with a dispersion of nanoparticles of the core material and are passed continuously through a reaction zone of a tubular reactor, and other starting materials for the shell material are fed to the reaction zone of the tubular reactor at two or more locations, preferably via a tubular membrane, and the starting materials for the shell material react in the reaction zone to form a shell around the nanoparticles of the core material. The invention also relates to the tubular reactor with the membrane and its use for the continuous synthesis of core-shell nanoparticles.;The invention also relates to core-shell nanoparticles comprising a core of a core material, preferably of a first semiconductor material, and an outer shell of a shell material, characterized in that, between core and shell, there is only a layer of a transition zone, in which the proportion of the core material gradually decreases toward the shell, while the proportion of the shell material gradually increases.

主权项

1. A process for the continuous preparation of core-shell nanoparticles comprising a core of a core material, preferably of a semiconductor material, and a shell of a shell material, preferably of a semiconductor material, the process comprising the steps of:
a) preparing a dispersion of nanoparticles of the core material in a solvent, b) providing all starting materials for the shell material, preferably in dissolved form, c) the selection of one or more starting materials for the shell material for the step d), the selection being made so that the selected starting materials do not react with each other, d) mixing the selected starting material or the selected starting materials for the shell material with the dispersion of the nanoparticles from the core material, e) continuously passing the mixture obtained in step d) through a reaction zone (10) of a tubular reactor, f) continuously feeding the starting material not selected in step c) or the starting materials not selected in step c) for the shell material at two or more locations to the reaction zone (10), g) reacting the starting materials for the shell material in the reaction zone (10) to form a shell around the nanoparticles from the core material.