ZnS and DDT (dodacanthiol-1) capping in CdSe nanoparticles

CdSe nanoparticles were prepared by reverse micelle technique. Optical absorption and luminescence studies were carried out for samples prepared for different water to surfactant ratio. The prepared nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), UV–vis absorption and photoluminescence (PL) spectra. The XRD analysis showed that the starch capped CdSe nanoparticles were of the hexagonal structure, the average particle size was calculated to be about 3 nm according to the Debye–Scherer equation. Transmission electron microscopy (TEM) shows formation of CdSe nanowire for CdSe NPs synthesized at water to surfactant ratio of 10. ZnS and dodecanethiol-1 (DDT) capping were used to passivate the surface of CdSe particles. The optical properties showed a red shift in the band gap for the capped material.