کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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609972 | 880636 | 2009 | 5 صفحه PDF | دانلود رایگان |
Silica-coated ZnS:Mn nanoparticles were synthesized by coating hydrophobic ZnS:Mn nanoparticles with silica shell through microemulsion. The core–shell structural nanoparticles were confirmed by X-ray diffraction (XRD) patterns, high-resolution transmission electron microscope (HRTEM) images and energy dispersive spectroscopy (EDS) measurements. Results show that each core–shell nanoparticle contains single ZnS:Mn nanoparticle within monodisperse silica nanospheres (40 nm). Photoluminescence (PL) spectroscopy and UV–vis spectrum were used to investigate the optical properties of the nanoparticles. Compared to uncoated ZnS:Mn nanoparticles, the silica-coated ZnS:Mn nanoparticles have the improved PL intensity as well as good photostability. The obtained silica-coated ZnS:Mn nanoparticles are water-soluble and have fluorescence sensitivity to Cu2+ ions. Quenching of fluorescence intensity of the silica-coated nanoparticles allows the detection of Cu2+ concentrations as low as 7.3 × 10−9 mol L−1, thus affording a very sensitive detection system for this chemical species. The possible quenching mechanism is discussed.
The silica-coated ZnS:Mn nanoparticles (QDs/SiO2) are water-soluble and have selective fluorescence sensitivity to Cu2+, which are employed as a novel fluorescent sensor for the determination of Cu2+.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 339, Issue 1, 1 November 2009, Pages 78–82