title: Gamma ray effects on optical properties of CoS nanoparticles.
abstract: 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 (60)Co and (137)Cs 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 Co(2+) 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.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran. sohrabnezhad@guilan.ac.ir
authors.forename: Sh
authors.initials: Sh
authors.lastname: Sohrabnezhad
authors.forename: D Rezaei
authors.initials: DR
authors.lastname: Ochbelagh
authors.forename: M Kashefi
authors.initials: MK
authors.lastname: Biroon
mesh_terms: D003035:Cobalt / Q000737:chemistry* / Q000528:radiation effects*; D005720:Gamma Rays; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D055620:Optical Phenomena; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D003035:Cobalt; C027875:cobaltous sulfide