کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11006529 | 1505858 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Red emissive Ag2Se quantum dots (QDs) with room-temperature synthesis of both orthorhombic and superionic cubic phases via stirring approach
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Red emissive Ag2Se quantum dots (QDs) with room-temperature synthesis of both orthorhombic and superionic cubic phases via stirring approach Red emissive Ag2Se quantum dots (QDs) with room-temperature synthesis of both orthorhombic and superionic cubic phases via stirring approach](/preview/png/11006529.png)
چکیده انگلیسی
In this research Ag2Se quantum dots (QDs) were synthesized with just a stirring room-temperature approach, using AgNO3 and Na2SeO3 as precursors and thioglycolic acid (TGA) as capping agent molecule. Synthesized QDs were characterized by means of XRD, FTIR, FESEM, EDS, HRTEM, UV-Vis and PL analyses. Synthesized QDs were in orthorhombic phase of Ag2Se (β-Ag2Se) with a uniform size distribution histogram between 1.8 and 2.5â¯nm. Synthesized QDs indicated two sharp exciton absorption peaks at 440 and 607â¯nm at room temperature and a narrow red emission between 600 and 800â¯nm with a peak at about 673â¯nm and FWHM of about 57â¯nm. The quantum yield was obtained about 4.48% which is highest among reported values. It was found that orthorhombic (β-Ag2Se) and superionic cubic (α-Ag2Se) phases can simply be formed at room temperature only by changing the sequence of addition of TGA capping agent. The cubic phase co-exists with orthorhombic phase was identified by XRD and it revealed also exciton absorption bands at room temperature due to strong quantum confinement effects.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 204, December 2018, Pages 419-423
Journal: Journal of Luminescence - Volume 204, December 2018, Pages 419-423
نویسندگان
B. Ramezanloo, M. Molaei, M. Karimipour,