A new and straightforward synthesis route for preparing Cds quantum Dots

Abstract In this work, highly stable, soluble and luminescent CdS quantum dots (QDots) with a narrow size distribution were synthesized in ethylene glycol using the polyol process and the solvothermal technique. In this case instead of using a conventional highly toxic sulfur source like H 2 S, we use elemental sulfur dissolved in ethylene glycol to perform the reaction. When the solvent reaches its boiling point inside the autoclave, sulfur is reduced to S −2 and reacts with Cd +2 ions to form CdS nanocrystals. Analysis of the spectroscopic and TEM measurements showed that 3 nm monodispersed CdS QDots were synthesized and exhibited high photoluminescence (PL) in the blue green region of the spectra when excited with 355 nm.