Original Articles: 2012 Vol: 4 Issue: 5
The Synthesis and Characterization of Core-Shell Quantum Dots via Three-Phase System
Abstract
The CdS/ZnS quantum dots (QDs) were synthesized via three-phase system. Transmission electron microscopy (TEM) and X-ray powder diffraction (XRD) techniques were used to characterize the as-synthesized QDs. The growing mechanism of the quantum dots in the phase-transfer process was discussed. As result, the QDs are narrow sized distribution, uniform morphology and cubic crystal structure. The result of PL spectroscopy measurements reveals that the exciton emission of CdS was greatly improved by covering with a layer of ZnS. That demonstrates the shell of ZnS modified the surface of CdS core and reduced the surface defect.