Abstract
ZnS nanoparticles and nanorods with control over their crystal structure are fabricatedthrough a solvothermal approach by changing the solvent used for the synthesis. Thesynthetic approach is suitable to fabricate ZnS nanoparticles with various sizes by varyingthe synthesis temperatures. Quantum confinement phenomena are studied by tailoring theparticle sizes for both wurtzite and sphalerite polymorphs of ZnS. Photoluminescencestudies reveal that the surface states greatly influence the emissions from thenanostructures. Wurtzite nanoparticles exhibit band-edge related UV emission owing to theeffective surface passivation by the ethylene glycol molecules used as the solvent for thesynthesis. On the other hand, the photoluminescence spectra of the cubic nanoparticles aremainly dominated by their surface states. Some of the nanorod samples exhibitedZn-vacancy related green emissions along with the surface defect related blueemission band. It is also demonstrated that ZnS nanostructures could be easilydoped with useful impurities via this synthesis approach to tailor their luminescentproperties.
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