کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1428254 1509177 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Aqueous synthesis of highly luminescent glutathione-capped Mn2 +-doped ZnS quantum dots
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Aqueous synthesis of highly luminescent glutathione-capped Mn2 +-doped ZnS quantum dots
چکیده انگلیسی

In this paper, an aqueous-based route has been developed to prepare highly luminescent glutathione (GSH)-capped Mn-doped ZnS quantum dots (QDs). The dots obtained have an average diameter of 4.3 nm and exhibit the Mn2 +-related orange luminescence with very low surface defect density. The highest photoluminescence was observed for a Mn2 + to Zn2 + molar ratio of 3%. Consecutive overcoating of the Mn:ZnS@GSH QDs by a ZnS shell was done, and the core/shell structured QDs exhibit a PL quantum yield of 23%. Transmission electron microscopy, X-ray powder diffraction, electron spin resonance, X-ray photoelectron spectroscopy, UV–visible spectroscopy and spectrofluorometry have been used to characterize the crystal structure, the doping status, and the optical properties of the doped-QDs. Our systematic investigation shows that Mn:ZnS/ZnS@GSH QDs are highly promising fluorescent labels in biological applications.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: C - Volume 44, 1 November 2014, Pages 17–23
نویسندگان
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