| Abstract
| - A method for the synthesis of CdSe/ZnS core/shell nanorods is reported. In the first steprods are grown, and in a second step a shell of ZnS is overgrown at moderate temperaturesin a mixture of trioctylphosphine-oxide and hexadecylamine. Structural and chemicalcharacterization using transmission electron microscopy, X-ray diffraction, and energydispersive X-ray spectroscopy were performed providing direct evidence for shell growth.The emission quantum yield significantly increases by over 1 order of magnitude for thecore/shell nanorods compared to the original rods because of the improved surface passivation.Rods with lengths up to ∼30 nm were investigated, and in this size regime the maximalachievable QY showed little dependence on length and strong dependence on rod diameter,with increased QY in smaller diameters. Color tunability is available via tuning of the roddiameter. The stability against photooxidation was significantly improved in core/shellnanorods compared with rods coated by organic ligands.
- Core/shell nanorods with CdSe core and ZnS shell provide bright tunable fluorescence. The photograph shows the emission of four core/shell nanorod samples in solution. The photostability of such core/shell nanorods is significantly improved compared with that of rods coated by organic ligands.
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