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Thin films containing luminescent undoped zinc sulfide (ZnS) nanoparticles, with and without silica capping, were prepared via a simple method using sol-gel technique. Average particle size changed from 3 to 10 nm for the set of ZnS films and 2.5 to 7 nm for the set of ZnS–SiO 2 films when they were annealed from 473 to 673 K in a step of 50 K. The films containing ZnS nanoparticles without...
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