Investigation of optical and structural properties of aqueous CdS quantum dots under gamma irradiation

摘要

The optical properties of aqueous CdS quantum Dots (QDs) under gamma irradiation were systemically studied with dose of 0-20 kGy. The QDs synthesized by microwave assisted method with different size and concentration. By transmission electron spectroscopy (TEM) the size of particle was indicated about 3-4 nm. The results show that degrading of photoluminescence of QDs is strongly depended on concentration, so that the fastest degradation is corresponded to low concentration. In other side, redshift of PL peck and bandgap edge was strongly depend on the initial size of QDs, thus the smaller size had the largest redshift. The X-ray diffraction analysis did not show changes in crystalline structure after gamma irradiation. The FTIR results did not show changes after gamma irradiation, as well. It has been found that the main mechanism of the behavior of QDs under gamma irradiation is growth of CdS QDs. These results showed that CdS QDs have a high potential to use as gamma dosimeter.