کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5367883 | 1388376 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: CdS/ZnS core-shell nanoparticles in arachidic acid LB films CdS/ZnS core-shell nanoparticles in arachidic acid LB films](/preview/png/5367883.png)
Core-shell CdS/ZnS nanoparticles in arachidic acid film were prepared through a novel Langmuir-Blodgett (LB) approach. Post-deposition treatment of the precursor LB multilayers of cadmium arachidate with H2S gas followed by intercalation of Zn2+ ions and further sulfidation result in the formation of CdS/ZnS nanoparticles in the LB film. The formation of these nanoparticles and resulting changes in layered structures were studied by FTIR and X-ray reflection measurements. The optical properties were studied using UV-vis absorption and photoluminescence spectroscopy. A red-shift in the absorption spectrum and enhancement of CdS excitonic emission together with reduction of surface states emission suggest that after the intercalation step, a thin layer of ZnS surrounds the CdS nanoparticles, thus forming a core-shell structure. Subsequent to the second sulfidation, a further red-shift in absorption suggests the formation of a thicker ZnS coating on CdS. Electron diffraction of CdS nanoparticles coated with thicker ZnS showed the diffraction patterns of only ZnS, as expected for core-shell structures.
Journal: Applied Surface Science - Volume 254, Issue 16, 15 June 2008, Pages 5028-5033