Gamma ray effects on optical properties of CoS nanoparticles

In this work, cobalt sulfide nanoparticles powder was synthesized in AlMCM-41 molecular sieve by using ion exchange method. The influence of gamma ray-radiation on the structural and optical properties of CoS/AlMCM-41 nanoparticles has been studied. Sample was irradiated by 60Co and 137Cs gamma ray source. The sample was characterized by X-ray diffraction (XRD), UV–Vis spectroscopy, scanning electron microscopy (SEM), FT-IR techniques and transmission electron microscopy (TEM). The XRD patterns show that nanoparticles size is increased after gamma radiation. The DRS results show that Co2+ ions produced after gamma radiation, located in tetrahedral sites in AlMCM-41. The results indicate host materials have important role in decrease of radiation defects (RDs). The gamma ray creates free radicals and forms new bonds in CoSAlMCM-41 sample.

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► In the present investigation the AlMCM-41 was used as the host material, and CoS was selected as the guest molecule.
► The TEM images show average size of CoS NPs before and after neutron radiation about 20 and 70 nm, respectively.
► The results indicate host materials have important role in decrease of radiation defects (RDs).