Modified hybrid CdSe/ZnS quantum dots and their size dependent unique characteristics

Abstract In this study, CdSe-based hybrid CdSe/ZnS quantum dots were synthesized. Their optical properties have been characterized using the absorption and luminescence spectroscopy methods. When the ZnS shell was grown on the surface shell of CdSe nanoparticles, the photoluminescence stability and the shelf life of the quantum dots increased significantly. The energy of the outer shell has increased. The absorption and luminescence spectra shifted to a shorter wavelength range. The size of the nucleus decreased from 3.7 nm to 2.8 nm. The surface was stabilized with oleic acid as an active ligand. After stabilization with a surfactant, the average total hydrodynamic size of the nanoparticles increased.

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