کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1521936 | 995301 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas sensitive ZnO thin films with desired (002) or (100) orientation obtained by ultrasonic spray pyrolysis
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
Highly oriented ZnO thin films were obtained by ultrasonic spray pyrolysis. The precursor used was zinc oxide, dissolved in aqueous ammonia solution and acidified with different acids to achieve control over the growing morphology together with both substrate and annealing temperatures. Thus growth along c axis was promoted by adding CH3COOH in the solution, while a axis orientation occurs when HCl or HNO3 acid was used. The size of the crystallites of (002) ZnO layers is smaller than those of (100) textured films. Secondary particles are growing on top of the resulting surfaces, their density higher and ordering more pronounced on the (100) films. The dark electrical conductivity and its changes upon exposure to ammonia, ethanol, acetone and water vapours were also investigated. It has been obtained that the conductivity of the (100) oriented films is significantly lower and its vapour-induced changes are higher than those of the (002) films.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 148, Issue 3, 15 December 2014, Pages 712-719
Journal: Materials Chemistry and Physics - Volume 148, Issue 3, 15 December 2014, Pages 712-719
نویسندگان
O. Dimitrov, D. Nesheva, V. Blaskov, I. Stambolova, S. Vassilev, Z. Levi, V. Tonchev,