کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7887260 | 1509788 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Terbium-doped ZnS quantum dots: Structural, morphological, optical, photoluminescence, and photocatalytic properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Terbium (0, 2, and 4â¯at%)-doped ZnS quantum dots (QDs) were synthesized via a solvothermal method. The crystal structures of the synthesized QDs were determined to be zinc blend by X-ray powder diffraction (XRD) and Raman analyses. Transmission electron microscopy (TEM) studies revealed that particles with a mean size of 2-4â¯nm were formed. An X-ray photo electron spectroscopy (XPS) examination disclosed the existence of terbium with a trivalent state in the ZnS host lattice. The absorption bands of all QDs were located around 325â¯nm (3.81â¯eV) and were higher than that of the bulk ZnS band gap (3.67â¯eV), consistent with the quantum confinement effect. The photoluminescence spectra of the terbium-doped samples displayed five emission peaks at 467â¯nm (5D4â7F3), 491â¯nm (5D4 â 7F6), 460â¯nm (5D4 - 7F5), 484â¯nm (5D4 - 7F4), and 530â¯nm (5D4 - 7F3), respectively. The terbium-doped QDs exhibited a higher photocatalytic activity during the degradation of crystal violet dye under UV-light illumination compared to the undoped ZnS QDs. These interesting properties of terbium-doped ZnS QDs are potentially useful for both luminescent and photocatalysis applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 10, July 2018, Pages 11724-11729
Journal: Ceramics International - Volume 44, Issue 10, July 2018, Pages 11724-11729
نویسندگان
B. Poornaprakash, U. Chalapathi, Youngsuk Suh, S.V. Prabhakar Vattikuti, M. Siva Pratap Reddy, Si-Hyun Park,