کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
610810 880659 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, growth process and photoluminescence properties of SrWO4 powders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Synthesis, growth process and photoluminescence properties of SrWO4 powders
چکیده انگلیسی

SrWO4 powders were synthesized by the co-precipitation method and processed in a microwave-hydrothermal (MH) at 140 °C for different times. The obtained powders were analyzed by X-ray diffraction (XRD), micro-Raman (MR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, field-emission gun scanning electron microscopy (FEG-SEM), ultraviolet–visible (UV–vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectra showed that the SrWO4 powders present a scheelite-type tetragonal structure without the presence of deleterious phases. FT-IR spectra exhibited a high absorption band situated at 831.57 cm−1, which was ascribed to the WO antisymmetric stretching vibrations into the [WO4] tetrahedron groups. FEG-SEM micrographs suggested that the processing time is able to influence in the growth process and morphology of SrWO4 powders. UV–vis absorption spectra revealed different optical band gap values for these powders. A green PL emission at room temperature was verified in SrWO4 powders when excited with 488 nm wavelength.

Collision mechanism between small particles inside the Teflon autoclave of a microwave-hydrothermal system and micrograph of SrWO4 powders with octahedron-like morphology.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 330, Issue 1, 1 February 2009, Pages 227–236
نویسندگان
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