Optical and Structural Properties of Cu Doped ZnS Nanocrystals: Effect of Temperature and Concentration of Capping Agent

Abstract

We have provided the Cu doped zinc sulfide (ZnS:Cu) nanoparticles using a wet chemical synthesis. In principle, the nanoparticles are provided by mixing the reactants in a double distilled water solvent. We have used the mercaptopropionic acid as the capping agent. We have obtained the physical properties of the nanoparticles using the methods: UV absorption, photoluminescence spectroscopy, and X-ray diffraction analysis. The average size of nanoparticles is obtained in the range 3-6 nm. In addition, the X-ray diffraction pattern of ZnS:Cu nanoparticles reveals a zinc-blende crystal structure at room temperature.

Energy transfer and luminescence enhancement of Cu2+ ions in polyvinyl pyrrolidone caped ZnS:Cu nanoparticles

“…So far, the nature of the green PL band there still exists two different perspectives. These PL band can be characteristic displacement of Cu + ions (3d 10 ) 11,12) or characteristic displacement of Cu 2+ ions (3d 9 ), in which the electrons transfer from the donor V S or the interstitial atoms to the t 2 level of the Cu 2+ ions (3d 9 ) 13,15) in ZnS:Cu nanoparticles. However, in solution, the Cu + ions always tend to convert 35) to Cu 2+ and Cu, in addition, the participation of Cu + or Cu 2+ in ZnS: Cu is highly dependent on the synthesization process and the initial Cu ion source.…”

“…[7][8][9][10] Besides that, due to Cu element has many different oxidation states, so recently the nature of the green photoluminescence (PL) band still exists two different perspectives, in which they can be characteristic of Cu + ions (3d 10 ) 11,12) or Cu 2+ ions (3d 9 ) or the interstitial atoms. [13][14][15] Therefore, at present, the influence of Cu 2+ on the optical and photocatalytic properties of Cu doped ZnS [16][17][18] and the role of Cu + to p-type conductivity 19,20) in further applications of Cu doped ZnS thin films are still under consideration.…”

Effect of synthesis method and chemical reagents on the structural parameters, particle size, and optical and photoluminescence properties of ZnS nanostructures

“…One of the best phosphor materials is ZnS mainly due to its wide band gap (3.7 eV) that make it a transparent material in the visible and infrared region, and large exciton binding energy (38 meV) . These properties enable it to be used in different optoelectronic devices such as emitter diodes, information transfer cells and solar cells, plus as display units and sensors.…”

Effect of rapid thermal annealing on optical properties of zinc sulphide thin films

“…However, some authors have obtained the hexagonal form for ZnS films and others have observed cubic structure. [10][11][12][13][14][15][16][17] The effects of annealing temperature were observed by many authors in different materials; for example, with varying the temperature of CdZnTe from room temperature to 400°C, the band gap is changed from 1.39 to 1.45 eV 18 and also in thin film of ZnMgO is deposited on a Si substrate annealed in the temperature range from 400 to 800°C in air. The results showed that the film introduces recrystallisation with increase in temperature.…”

“…However, some authors have obtained the hexagonal form for ZnS films and others have observed cubic structure. 10-17…”