Polycation‐Capped CdS Quantum Dots Synthesized in Reverse Microemulsions

Abstract

This paper is focused on the formation and recovery of cadmium sulfide (CdS) nanoparticles in two different types of polycation-modified reverse microemulsions using low molecular weight poly(diallyldimethylammonium chloride) (PDADMAC) and poly(ethyleneimine) (PEI). Both polymers were incorporated in a quaternary w/o microemulsion consisting of water, toluene-pentanol (1 : 1), and sodium dodecyl sulfate (SDS), as well as in a ternary w/o microemulsion consisting of water, heptanol, and 3-(N,N-dimethyl-dodecylammonio)-propanesulfonate (SB). UV-vis and fluorescence measurements in the microemulsion illustrate the capping effect of the polycations on the formation of the CdS quantum dots. The nanoparticles are redispersed in water and characterized by using UV-vis and fluorescence spectroscopy, in combination with dynamic light scattering. From the quaternary microemulsion, only nanoparticle aggregates of about 100 nm can be redispersed, but, from the ternary microemulsion, well-stabilized polycation-capped CdS quantum dots can be obtained. The results show that the electrostatic interactions between the polycation and the surfactant are of high relevance especially in the solvent evaporation and redispersion process. That means only that in the case of moderate polycation-surfactant interactions a redispersion of the polymer-capped CdS quantum dots without problems of aggregation is possible.

Simulation of AOT reverse micelles with polyethylenimine in hexane

“…In case of water-in-oil microemulsions (reverse micelle, RM) systems with different types of polymers and surfactants have been also reported [15][16][17][18]. For instance, the incorporation of the cationic PELs poly(diallyldimethylammonium chloride) PDADMAC and poly(ethyleneimine) (PEI, Figure 1a) into sodium dodecyl sulfate (SDS) and sulfobetainebased (SB) RMs have been studied by Lemke and Koetz [18]. They show that RM can be successfully used for the synthesis of polymer-capped CdS nanoparticles.…”