Abstract
Nanohybrids of zinc selenide and smectites (a natural montmorillonite and a synthetic saponite) were prepared by a hydrothermal reaction of zinc chloride and sodium selenosulfite in the presence of smectites. The products were characterized by powder X-ray diffraction, scanning and transmission electron microscopies, thermogravimetric analysis, as well as, UV–visible and photoluminescence spectroscopies. The round-shaped zinc selenide nanoparticles with the average diameter of 1–4nm formed in the interlayer space of smectites, which gave the absorption onsets at 379–456nm for montmorillonite system and at 475nm for saponite system. Additional absorption onsets were observed at around 478–665nm for montmorillonite system and at 609–682nm for saponite system, suggesting the larger-sized particles formed at the external surfaces. The photoluminescence observed in the wavelength range of 357–360nm was interpreted to the formation of zinc selenide nanoparticles in smectites. The increase of the photoluminescence intensities of all the products (from 35 for bulk ZnSe to 126–294 for ZnSe(n)-smectites) was thought to be caused by the interactions with smectites and/or size and shape of ZnSe formed in the hybrids.
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