کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1460198 989602 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and optical characterization of Zn0.95−xMg0.05AlxO nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural and optical characterization of Zn0.95−xMg0.05AlxO nanoparticles
چکیده انگلیسی

The structural and optical properties of ZnO nanoparticles doped simultaneously with Mg and Al were investigated. XRD results revealed the hexagonal wurtzite crystalline structure of ZnO. The FE-SEM study confirmed the formation of nano-sized homogeneous grains whose sizes decreased monotonously with increasing doping concentrations of Mg and Al. The absorption spectra showed that band gap increased from 3.20 to 3.31 eV with Mg doping. As the Al concentration changed from x=0.01 to x=0.06 mol% at constant Mg concentration the band gap observed to be decreased. Particle sizes estimated from effective mass approximation using absorption data and these values are in good agreement with the crystallite sizes calculated from XRD data. Raman spectra of ZnO showed a characteristic peak at 436 cm−1 correspond to a non-polar optical phonon E2 (high). With increase of the Al doping concentrations, E2 (high) phonon frequency shifted to 439 cm−1 from to 436 cm−1. The origin of E2 (high) peak shift in ZnO nanoparticles is attributed to optical phonon confinement effects or the presence of intrinsic defects on the nanoparticles. PL spectra indicated that with increase of Al co-doping along with Mg into ZnO, intensity of the peak positioned at 395 nm was initially increased at x=0 and then decreased with increase of the Al concentrations from x=0.01 to x=0.06 mol%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 41, Issue 8, September 2015, Pages 9276–9284
نویسندگان
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