Abstract
Chromium- and cobalt-doped zinc selenide nanoparticles were synthesized using a low-temperature reactive solution growth method. The morphological and optical characteristics were compared to those of doped zinc selenide (ZnSe) bulk crystals grown by the physical vapor transport (PVT) method. We observed agglomeration of particles; however, the thioglycerol capping agent has been shown to limit particle grain growth and agglomeration. This process enables doping by addition of chromium and cobalt salts in the solution. A slightly longer refluxing time was required to achieve cobalt doping as compared with chromium doping due to lower refluxing temperature. The nanoparticle growth process showed an average particle size of approximately 300 nm for both Cr- and Co-doped zinc selenide. The optical characterization of Co:ZnSe is ongoing; however, preliminary results showed a very high bandgap compared to that of pure ZnSe bulk crystal. Additionally, Co:ZnSe has an order of magnitude higher fluorescence intensity compared to bulk Cr:ZnSe samples.
Highlights
Zinc selenide (ZnSe) and zinc sulfide (ZnS) have been studied for several decades for their industrial applications
The foundation of vapor growth of ZnSe crystals using physical vapor transport was established by Lehoczky and his group [8–11]
We investigated a low cost and low-temperature process to develop nanoparticles of doped ZnSe
Summary
Zinc selenide (ZnSe) and zinc sulfide (ZnS) have been studied for several decades for their industrial applications Their low absorption coefficient and wide transparency range are key parameters for commercial and military devices and components. Several papers have been published to evaluate suitability of both ZnSe and ZnS for laser host materials [1–3,8,9] For this reason, ZnS and ZnSe have been suggested to be excellent matrix materials for doping with rare earth and transition metal ions (Cr2+, Co2+, Ni2+ and Fe2+). The vapor transport method utilized for the crystal growth of this class of materials is affected significantly by several parameters such as fluid flow, solutal and thermal convective effects These flows were extensively studied by performing microgravity experiments. Crystals 2022, 12, 71 morphological and optical characteristics of cobalt doped nanoparticles and c2oomf 8pare the characteristics with chromium-doped bulk materials and chromium-doped ZnSe nanopanardtiocpletisc.al characteristics of cobalt doped nanoparticles and compare the characteristics with chromium-doped bulk materials and chromium-doped ZnSe nanoparticles
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