期刊
APPLIED SURFACE SCIENCE
卷 255, 期 21, 页码 8879-8882出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.06.070
关键词
HMTA; ZnS nanoparticles; Hydrothermal; Photoluminescence
A hydrothermal method has been optimized for the synthesis of ZnS nanoparticles. The nanoparticles were stabilized using Hexamethylenetetramine (HMTA) as surfactant in aqueous solution. The self-assembling of the surfactant molecules in the water solution forms a unique architecture that can be adopted as the reaction template for the formation of nanomaterials. The average grain size of the nanoparticles calculated from the XRD pattern was of the order of 2 nm which exhibits cubic zinc-blende structure. TEM results showed that the synthesized nanoparticles were uniformly dispersed in the HMTA matrix without aggregation. The spectroscopic results revealed that the synthesized ZnS nanoparticles exhibits strong quantum confinement effect as the optical band gap energy increased significantly compared to the bulk ZnS material. Formation of HMTA capped ZnS nanoparticles were confirmed by FTIR studies. The PL spectra exhibit a strong green emission peak around 502 nm attributed to some self-activated defect centers related to Zn-vacancies. (C) 2009 Elsevier B.V. All rights reserved.
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