کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1876853 1531907 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cubic-to-hexagonal phase transition and optical properties of chemically synthesized ZnS nanocrystals
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Cubic-to-hexagonal phase transition and optical properties of chemically synthesized ZnS nanocrystals
چکیده انگلیسی

Cubic phase of ZnS nanocrystals, having particle size of 1.1–1.5 nm, is synthesized by the chemical co-precipitation method with different pH (4–12) of the reaction mixture. The nanostructures are characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV–Visible spectrophotometry. As-synthesized ZnS samples are annealed for 2 h at different temperatures (Tc), determined from the differential scanning calorimetry (DSC) study. The phase-transformation (∼25%) from cubic to hexagonal phase of ZnS has been observed at very low temperatures at ∼250 °C. Enhanced photoluminescence (PL) emissions are observed in the annealed samples as well as in the samples synthesized with higher pH values.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Results in Physics - Volume 2, 2012, Pages 150–155
نویسندگان
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