کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7990392 1516127 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic-optical bifunctional properties of sub-20 nm β-NaYF4:Yb3+, Er3+ @NaGdF4 core-shell nanocrystals
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Magnetic-optical bifunctional properties of sub-20 nm β-NaYF4:Yb3+, Er3+ @NaGdF4 core-shell nanocrystals
چکیده انگلیسی
In this work, the monodisperse spherical pure β-NaYF4:Yb3+,Er3+ core NCs with average size of 7.2 nm were synthesized by using NaOA as sodium source instead of the conventional NaOH, based on which the sub-20 nm β-NaYF4:Yb3+,Er3+@NaGdF4 core-shell NCs with magnetic-optical bifunctional properties were successfully obtained with seed-mediated growth method. The magnetization of the core-shell NCs enhanced proportionally with increased shell thickness, and the maximum upconversion intensity was three orders of magnitude increased in the 18.3 nm NaYF4: Yb3+,Er3+@NaGdF4 core-shell NCs compare with the corresponding core NCs. Besides, the upconversion mechanism for the core and core-shell NCs were discussed. This work may lead to an ideal platform for the preparation of sub-20 nm spherical NCs with magnetic and optical properties for application in biomedical imaging and drug delivery.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 767, 30 October 2018, Pages 775-781
نویسندگان
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