ZnS Nanospheres Research Articles

Synthesis and Characterization of Monodisperse Doped ZnS Nanospheres with Enhanced Thermal Stability

The monodisperse ZnS nanospheres, with an average diameter of 100 nm, were synthesized through a solvothermal method. Strong photoluminescence emission from blue to green and orange can be observed by doping these ZnS nanospheres with various cations (Mn2+, Cu2+, Al3+). An investigation is reported on the coating of ZnS nanospheres by a thin shell of SiO2 or TiO2 using a sol−gel process. X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS) were used for the characterization of the coated ZnS nanospheres. The photoluminescence properties demonstrated that not only the brightness of the coated nanospheres has been enhanced but also the thermal stability has been improved greatly.

Synthesis and Characterization of Monodisperse ZnS Nanospheres

Abstract The monodisperse ZnS nanospheres were synthesized by a solvothermal method. The nanospheres were characterized using XRD, TEM, UV–vis, and photoluminescence spectra. The results demonstrate that ZnS nanospheres are highly crystalline. The strong photoluminescence emission at 450 nm (blue) can be observed in the ZnS nanospheres.

Facile Synthesis of Hollow ZnS Nanospheres in Block Copolymer Solutions

Facile Synthesis of Hollow ZnS Nanospheres in Block Copolymer Solutions

Mie scattering effects from monodispersed ZnS nanospheres

Transmission spectra of monodispersed particles exhibit pronounced resonance features from which particle properties can be deduced. ZnS powders were used as model materials since they can be synthesized by homogeneous precipitation with a narrow size distribution. The optical extinction spectra can be simulated using Mie scattering theory, and can be used as an in situ diagnostic tool for following the growth of particles during precipitation reactions. Using results of particle diameter measurements by other methods, information on the refractive index of the particles can be retrieved, indicating a highly porous internal structure of the spheres. Distinct features in the experimental and simulated spectra have been interpreted as to arise from circumference and diameter resonance effects in the particles. The simultaneous observation of these two effects allows one to estimate size and solid volume fraction from simple transmission spectra by application of an effective-medium model for the simulation parameters. The potential of application of Mie resonance effects for selective light screening or as pigments are discussed.