An easy and economic method is proposed to synthesize zinc sulfide (ZnS) nanocrystals. Zinc sulfide nanoparticles with different particle sizes were prepared by solid-state reaction of zinc acetate and thioacetamide at low temperature. After annealing at 600°C in air, zinc oxide (ZnO) nanoparticles were obtained. The ZnS and ZnO nanoparticles were characterized by X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, differential thermal analysis and high-resolution analytical electron microscopy. The smallest crystallite size of ZnS nanoparticles obtained was 3.6nm in diameter and the temperature for synthesizing was 100°C. The room temperature PL spectrum of ZnS sample de-convoluted by using a Lorentzian fit showed four peaks and the mechanism of emission was explained. A 26-fold increase in photoluminescence intensity has been observed in comparison with conventionally made ZnS particles. The particle size of ZnO samples calculated from XRD consistent with the TEM image was 37nm and showed hexagonal structure. In the PL spectrum of ZnO nanoparticles, an emission peak at 501nm was observed which was assumed to be due to the energy level of oxygen vacancies in ZnO energy band gap. By means of this method, it is easy to prepare ZnS and ZnO nanocrystals without wasting much time.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry