Abstract
ZnS nanoparticles have been synthesized on a large scale by hydrothermal route using Hexamethylenetetramine (HMTA) as capping agent in aqueous solution. The average grain size of the nanoparticles calculated from the XRD pattern using Scherrer's formula is about 2–3 nm, which exhibit cubic zinc blende structure. TEM results showed that the synthesized nanoparticles were uniformly dispersed in the HMTA matrix without aggregation. The UV–vis absorption results revealed that the synthesized HMTA capped ZnS nanoparticles exhibit strong quantum confinement effect as the optical energy band gap increased significantly compared to the uncapped and bulk ZnS. Formation of HMTA capped ZnS nanoparticles was confirmed by FTIR studies. Emission spectra show that the HMTA capping not only increases the PL intensity, but also greatly improves the thermal stability of the ZnS nanoparticles.
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