Synthesis of CdSe Nanocrystals through a Reaction of H₂Se Gas and Cd²⁺ Ions in Aqueous Medium and Their Optical and Structural Properties

Abstract

Colloidal CdSe nanocrystals were synthesized by a reaction of H₂Se gas and Cd²⁺ ions in aqueous medium. The CdSe nanocrystals are characterized by UV‐vis absorption and photoluminescence spectra, AFM as well as XRD. The freshly synthesized CdSe sol shows a very weak photoluminescence (PL) and an unstructured absorption feature. Two methods, refluxing and UV irradiating, were used to activate the PL of as‐synthesized CdSe sol. The mechanism of the PL enhancement is discussed.

Keywords:

• CdSe nanoparticles
• synthesis
• refluxing
• irradiating
• photoluminescence

Acknowledgments

This work was financially supported by Excellent Young Teacher Program and Research Foundation of Returned Student Abroad, MOE of China. We also thank the Shanghai Education Committee for support.