Production of Core/shell/shell-Nanoparticles in a Continuous Flow Reactor

D. Ness, V-H Tran, J. Niehaus, H. Weller
CAN GmbH, DE

Keywords: semiconductor nanoparticles, continuous flow, production, visible range

Summary:

In our group we have developed a continuous flow approach for the synthesis of fluorescent, Cd-based nanoparticles mimicking the well-known hot-injection procedure. The production of NPs in such system gives some crucial advantages over the common batch synthesis: •reaction conditions can simply be modified and adjusted •easy optimization of particle systems by rapid screening of parameters •avoiding wastage of expensive materials and time •high reproducibility of NP properties and production even to the kg-scale possible Within this paper we report the production of fluorescent CdSe/ZnxCd1-xS/ZnS core/alloy-shell/shell nanoparticles for the first time with a range of the emission maximum from 550 to 625 nm. They show a quantum efficiency of up to 80%. Changing the synthetic properties of the CdSe core for the production of particles with the same emission wavelength, it can be shown that the outcome in terms of spectroscopic features seems to be identical, while the stability and shell-coverage can be significantly improved. Therefore these particles are promising for above-mentioned applications.