A. Khalilzadegan - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
M.S Sadjadi - Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran

II-VI semiconductor nanoparticles are presently of great interest for their applications in optoelectronics and photonics. In the present study, our aim was to find easy and reproducible methods to produce CdS nanoparticles. In the present study, we propose the preparation of CdS nanoparticles at ۹0 o C by co-precipitation method and two different capping agents, ehtylene glycol (EG) and ethylenediamine tetra acetic acid (EDTA) were employed. The CdS nanoparticles obtained were characterized by XRD, SEM and UV–vis spectra. The XRD analysis shows that the samples prepared are in a hexagonal phase. The broad peak of the XRD pattern indicates the nanocrystalline behavior of the particles. The average nanocrystallite sizes calculated from Debye–Scherrer formula were found to be 9.2 nm and 16.5 nm for EDTA capped CdS and EG capped CdS nanoparticles and the absorption peak appears at around 309.2 and 463 nm respectively, which is fairly blue-shifted from the absorption edge of the bulk. The morphology of the CdS nanoparticles was studied by SEM. The observed spherical morphology is same for samples. EDTA-capped CdS nanoparticles had a smaller particle size and showed better dispersity than the EG-capped CdS.

CdS, nanoparticles, Semiconductor, Cadmium sulfide, EDTA, ehtylene glycol