کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1521566 1511810 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Into the nature of Pd-dopant induced local phonon modes and associated disorders in ZnO; based on spatial correlation model
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Into the nature of Pd-dopant induced local phonon modes and associated disorders in ZnO; based on spatial correlation model
چکیده انگلیسی
In this paper a comprehensive study has been conducted to investigate the effect of palladium dopant (Pd) on the interior disordered properties of ZnO in terms of spatial correlation-length (L). Spatial correlation model is employed to explicate and gets insight of the broadening and asymmetry of the first-order optical phonon mode induced by the do-pant potential fluctuation. Apart from the conventional phonon modes associated with w-ZnO, origin of the additional local modes associated with Pd and subsequently dopant induced blue-shift in the principle E2 (high) phonon mode has been assessed. The system so--investigated is a chemically prepared composite Zn1−xPdxO (with x = 0, 2, 4 and 6 at %) nanopowder. Photoluminescence shows a blue-shift in the UV emission as a consequence of the extension of energy band-gap. The structural analysis based on X-ray diffraction reveals the absence of Pd-related secondary phases in contradicts to Raman analysis suggests Raman as the most sensitive technique. Crystallite size (D), dislocation density (δ) and optical band-gap (Eg) so-determined are correlated to spatial correlation-length “L” to account for the observed properties in photo-catalytic applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 153, 1 March 2015, Pages 248-255
نویسندگان
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