Abstract
Cerium-doped zinc sulfide nanorods with flower-shaped morphology have been successfully syn- thesized in air atmosphere through simple chemical pre- cipitation method. The incorporation of Ce 3? was confirmed by X-ray diffraction and energy-dispersive spectrum. The doping of Ce 3? ions has significant influ- ence on the optical properties of the synthesized rods. UV- Vis absorption spectroscopy measurements have shown that the absorption peak of doped ZnS was red shifted compared to undoped ZnS. Photoluminescence measure- ments reveal that luminescence intensity of Ce 3? was enhanced considerably by the energy transfer from ZnS. The existence of functional groups was identified using Fourier transform infrared spectrometer. Field emission scanning electron microscope results show a uniform growth pattern of the nanorods with flowerlike structure. High resolution transmission electron microscopy results showed that the doped ZnS nanocrystals are composed of uniform nanorods with average diameter of 22 nm and length of 140 nm. The thermal stability of the nanorods was confirmed using thermo gravimetric and differential thermal analysis.
Highlights
In the modern scientific era, optical properties of doped semiconductor nanoparticles have shown great impact as their electronic structure and electro magnetic fields are drastically modified due to quantum confinement effects
Cerium-doped zinc sulfide nanorods with flower-shaped morphology have been successfully synthesized in air atmosphere through simple chemical precipitation method
On the other hand, when we studied the optical absorption for various concentrations of cerium, the peak position has no major change with doping concentrations
Summary
In the modern scientific era, optical properties of doped semiconductor nanoparticles have shown great impact as their electronic structure and electro magnetic fields are drastically modified due to quantum confinement effects. Since ZnS has wide band gap of 3.68 eV at room temperature, its nanocrystals are the suitable host materials for the doping elements such as RE and transition metal ions which are optically and magnetically active. Different synthesis routes have been suggested for the preparation of RE-doped ZnS nanorods under low temperature and in particular, the effect of dopant on the structures and optical properties are limited (Wang and Fan 2006). We have attempted with a simple chemical precipitation method to prepare the Ce3?-doped flower-shaped ZnS nanorods. From this method, cerium-doped nanorods of ZnS with flowerlike morphology have been obtained
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