کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7992290 | 1516146 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and properties of alloyed CdxZn1-xSe core and manganese-doped CdxZn1-xSe/ZnS core/shell nanocrystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have successfully synthesized ternary CdxZn1-xSe alloy quantum dots (QDs) and CdxZn1-xSe/ZnS core/shell nanocrystals. In order to be used as a fluorescent/paramagnetic bi-functional probe, the ZnS shell was doped with 0.1% and 5% of paramagnetic manganese ions. The compositions of Cd, Zn, and Se in the CdxZn1-xSe core QDs were identified by energy-dispersive X-ray spectroscopy (EDS), and the crystal structures of the alloy nanocrystals were identified by wide angle X-ray diffraction (WAXD). The particle size and distribution of nanocrystals were determined by dynamic light scattering (DLS) and transmission electron microscopy (TEM). By varying the ratio of Cd:Zn in the CdxZn1-xSe core, the band gaps of CdxZn1-xSe nanocrystals became adjustable and were in the range of 1.92â¯eV to 2.72â¯eV. Hence, the fluorescent color of nanocrystals varied from red to blue in the visible light region. The CdxZn1-xSe/ZnS core/shell nanocrystals exhibited superior photoluminescence (PL) quantum yield up to 50%. Compared with CdxZn1-xSe cores, the PL emission peaks of CdxZn1-xSe/ZnS core/shell QDs are red-shifted. Electron paramagnetic resonance (EPR) measurements for manganese-doped CdxZn1-xSe/ZnS nanocrystals showed paramagnetic properties at both low and high Mn2+ concentrations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 748, 5 June 2018, Pages 265-272
Journal: Journal of Alloys and Compounds - Volume 748, 5 June 2018, Pages 265-272
نویسندگان
Chien-Hao Huang, Chien-Hsin Yang, Yeong-Tarng Shieh, Tzong-Liu Wang,