Synthesis of CdSe Nanoparticles: Control of Reaction Temperature

Abstract

Nanoparticles such as cadmium selenide (CdSe) have unique optical properties in term of band gap. These properties can be adjusted by controlling the size of nanoparticles. In this research we have synthesized different sizes of CdSe nanoparticles by controlling the reaction temperatures at 260 oC and 300 oC using a hot injection method. The as-synthesized CdSe nanoparticles were characterized using UV-visible spectroscopy and high resolution transmission electron microscope. From the UV-visible absorption spectra, the absorption peak of CdSe nanoparticles synthesis at growth temperature of 260 oC was 521 nm with estimated particle diameter of 2.57 nm, and for 300 oC the absorption peak was at 601 nm with estimated particle diameter of 4.63 nm. This indicates that the size of CdSe nanoparticles can be controlled by controlling the reaction temperature.