Synthesis of Very Thin 1D and 2D CdWO4 Nanoparticles with Improved Fluorescence Behavior by Polymer-Controlled Crystallization

With double jets to nanobelts: Well-defined very thin CdWO4 nanorods/nanobelts can be easily synthesized by double-jet crystallization in aqueous solution at room temperature in the absence of a polymeric crystallization modifier (see picture, left). Further hydrothermal ripening leads to the self-assembly of the nanorods/nanobelts into raftlike bundles, whereas very thin 2D sheetlike nanocrystals (see picture, right) and 1D nanorods with diameter 2.5 nm are obtained in the presence of double-hydrophilic block copolymers. Both the 1D and 2D polymer-modified species show highly increased fluorescence efficiency.