Abstract

Zinc sulphide (ZnS) and zinc selenide (ZnSe) and manganese-doped and un-doped with different morphologies from 1D do 3D microflowers were successfully fabricated in only a few minutes by solvothermal reactions under microwave irradiation. In order to compare the effect of microwave heating on the properties of obtained nanocrystals, additionally the synthesis under conventional heating was conducted additionally in similar conditions. The obtained nanocrystals were systematically characterized in terms of structural and optical properties using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV-Vis spectroscopy (DR UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area analysis. The photocatalytic activity of ZnSe, ZnS, ZnS:Mn and ZnSe:Mn nanocrystals with different morphologies was evaluated by the degradation of methyl orange (MO) and Rhodamine 6G (R6G), respectively. The results show that Mn doped NCs samples had higher coefficient of degradation of organic dyes under ultraviolet irradiation (UV).

Highlights

  • Since 1972, when Fujishima and Honda reported [1] the photocatalytic water splitting by titanium dioxide (TiO2) electrode, inorganic semiconductors have been considered a promising material for photocatalytic degradation of pollutants due to photocatalytic reactions [2], [3]

  • Due to its band gap, which is about 2.4 eV, cadmium sulphide (CdS) is considered a promising material for optoelectronic applications and for the previously mentioned photocatalytic application, many forms of CdS were synthesized and investigated [8]–[11]

  • The zinc sulphide (ZnS) and ZnSMn NCs were synthesized in a microwave assisted synthesis with ethylenediamine or hydrazine as a synthesis stabilizer

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Summary

Introduction

Since 1972, when Fujishima and Honda reported [1] the photocatalytic water splitting by titanium dioxide (TiO2) electrode, inorganic semiconductors have been considered a promising material for photocatalytic degradation of pollutants due to photocatalytic reactions [2], [3]. ZnS nanoparticles are considered promising materials for optoelectronic, electronic, photocatalytic and biomedical applications.

Results
Conclusion

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