کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5398678 1505890 2016 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A fast bottom-up route for preparing CdS quantum dots using laser ablation in a liquid environment
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
A fast bottom-up route for preparing CdS quantum dots using laser ablation in a liquid environment
چکیده انگلیسی
In this paper bright, water-dispersible and very stable CdS quantum dots (QDs) emitting from 400 to 700 nm with a narrow size distribution were synthesized in aqueous medium using a combination of the laser ablation technique and the action of thioglycerol as a catalyst for the hydrolysis of thiosulfate and as a stabilizing agent for the nanoparticles. In this case, instead of using a conventional, highly toxic sulfur source like H2S, the decomposition of thiosulfate catalyzed by thioglycerol is used to produce S2− ions that interact with Cd2+ ions produced by the ablation of a Cd foil by the second order light of a pulsed Nd:YAG laser. The ejected Cd2+ ions react with S2− to form CdS quantum dots. Spectroscopic, X-ray and TEM measurement analysis showed that 2.75 nm monodisperse CdS QDots were synthesized and exhibited bright photoluminescence in the yellow-orange region of the spectra when excited with 355 nm with a quantum yield of 3.25%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 171, March 2016, Pages 79-84
نویسندگان
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