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Generation and Optical Properties of Monodisperse Wurtzite-Type ZnS Microspheres

2006; American Chemical Society; Volume: 45; Issue: 18 Linguagem: Inglês

10.1021/ic060936u

1520-510X

Qingzhi Wu, Huaqiang Cao, Sichun Zhang, Xinrong Zhang, Daniel Rabinovich,

Nanocluster Synthesis and Applications

Monodisperse wurtzite-type ZnS microspheres have been prepared by using glutathione (GSH) as a sulfur source at low reaction temperatures ranging from 160 to 210 °C. The diameter of the ZnS microspheres can be tuned from ∼254 to ∼597 nm by changing the reaction parameters such as temperature, molar ratio of reactants (GSH/Zn2+), and reaction medium (ethylenediamine or ammonia). Our results demonstrate that monodentate amines (ammonia) play the same role as that of bidentate amines (ethylenediamine) in the formation of the wurtzite-type ZnS microspheres. The formation process of the monodisperse ZnS microspheres consists of a GSH-dominated nucleation process and an amine-dominated assembly process. The as-synthesized monodisperse ZnS microspheres readily self-assemble into ordered hexagonal patterns and thus have potential applications as colloidal crystalline materials. Blue fluorescence emission peaks at 415 and 466 nm in wavelength, attributed to deep-trap emission, are observed at room temperature.