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The zns powder is a kind of luminous material with wide band gap. It is widely used in digital, symbol and automatic simulation display, computer terminal and radar display and large screen display in military, transportation, post and telecommunications. It has the ability to absorb UV light and glow in the dark. It can be recharged for 1,000’s of times and is easy to store and transport. It is also used to make glow in the dark toys and novelties. It has a very fast charging and a long lasting glow of about an hour.
The elemental composition and oxidation states of the synthesized zns powder were determined by X-ray photoelectron spectroscopy (XPS). The only detected elements in the analyzed samples were Zn, S and C. The oxidation state of the Zn atoms was found to be trivalent. The X-ray diffraction patterns of the undoped and doped zns powder were obtained using a Bruker D8 Discover diffractometer. The diffraction pattern of the doped sample showed the presence of sulfur vacancies.
The morphology of the zns powder was investigated by field-emission scanning electron microscopy (FESEM). Compared with the non-annealed zns, the annealed one had a more uniform shape and size. The FESEM images also revealed that the agglomeration of the zns particles was reduced in the annealed sample. This was attributed to the fact that the surface of the nanoscopic particles had a larger surface-area-to-volume ratio than that of the bulk material. As a result, the bonding energy of the nanoparticles was lower.