Study on Synthesis and Fluorescent Property of CdS Nanocrystals

The preparation of high-quality CdS semiconductor nanocrystallites of wurtzite structure is described.Crystallites about 10nm in diameter with consistent crystal structure and a high degree of monodispersity were synthesized using cadmium acetate dehydrates and L-cysteine as precursors via hydrothermal method,which separates nucleation stage from growth stage and favors forming of nanocrystals with perfect structure after Ostwald ripening process and sufficiently structural adjustment.High sample quality results showed in sharp fluorescence excitation at 338nm in wavelength and strong photoluminescence emission at 419nm in wavelength.The crystallite structure was characterized by a combination of transmission electron microscopy(TEM),high resolution transmission electron microscopy(HRTEM),X-ray powder diffraction(XRD) spectrum.Parameters influencing sizes and photoluminescence are discussed.