Synthesis and characterization of CdSe nanoparticles

摘要

CdSe capped with TSC nanoparticles was prepared by chemical method at room temperature. Spin coating method has been used to deposited thin film on the glass substrates at room temperature. The morphological, structural and optical properties of the thin film are characterized by transmission electron microscope, atomic force microscope and optical absorption and Photoluminescence measurements. The average roughness of CdSe thin film is 0.935 nm and the average diameter is 44 nm. The direct optical band gap (Eg) has been determined from the absorption coefficient which is equal to 2.2 eV. The increase in the band gap value of our thin films as compared to bulk is due to the quantum confinement effect. These nanoparticles were found to display strong photoluminescence with emission peaks at the green region. Increases of excitation wavelength lead to an increase in emission intensity.