Method for producing core/shell nanoparticles and core/shell nanoparticles

The present invention relates to a method for continuously producing core/shell nanoparticles, which comprise a core of a core material, preferably of a semiconductor material, and a shell of a shell material, preferably of a semiconductor material, in which selected starting substances for the shell material mixed together with a dispersion of nanoparticles of the core material are passed continuously through a reaction zone of a tubular reactor, and further starting substances for the shell material are fed in at two or more points, preferably by way of a tubular membrane, to the reaction zone of the tubular reactor, and the starting substances 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 membrane and to the use thereof for the continuous synthesis of core/shell nanoparticles. The invention also relates to core/shell nanoparticles, which comprise a core of a core material, preferably a first semiconductor material, and an outer shell of a shell material, characterized in that between the core and the shell there is only one layer of a transitional zone, in which the proportion of core material gradually decreases in the direction of the shell and at the same time the proportion of the shell material gradually increases.