دوره 27، شماره 4 - ( 10-1398 )
جلد 27 شماره 4 صفحات 984-975 |
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1- دانشگاه دامغان
چکیده: (2422 مشاهده)
در این پژوهش، نانوذرات نیمرسانای اکسید روی آلاییده با ناخالصی آلومینیوم (AZO) با استفاده از نمک اولیه نیترات روی و عامل کمپلکس ساز اتیلن گلیکول با نسبت مولی آلومینیوم به روی 0، 2، 4، 6 و 10 درصد به روش حلال گرمایی سنتز شدند. ساختار بلوری و ریختار سطح نمونههای تهیه شده توسط پراشسنج پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی اثر میدان (FESEM) و میکروسکوپ الکترونی عبوری (TEM) بررسی شد. نتایج پراش پرتو ایکس نشان داد که نمونهها دارای قلههای ارجح مربوط به صفحات (100)، (002)، (101)، (102)، (110) و (103) فاز اکسید روی با ساختار بلوری ششگوشی ورتسایت هستند. با افزایش تراکم ناخالصی، جایگاه قلهها به سمت زاویههای بالاتر جابهجا میشوند، اندازه نانو بلورکها روند افزایشی و ثابتهای شبکه روند کاهشی دارند. اندازه نانو بلورکها در گستره 51/17 تا 21/26 نانومتر است. تصاویر FESEM و TEM نمونهها نشان دادند که افزایش درصد ناخالصی آلومینیوم باعث افزایش اندازه دانهها و نانو ذرات شده است. گاف نوری نانوذرات در گستره 5/2 تا eV 79/2 است. با افزایش مقدار ناخالصی آلومینیوم از صفر تا 4%، گاف نوری به تدریج کاهش یافته و با افزایش بیشتر ناخالصی گاف نوری افزایش مییابد. بررسی ویژگی های حسگری به گاز استون در نمونهی با 4% ناخالصی نشان داد که بیشترین زمان پاسخ 60 ثانیه برای غلظت ppm 2300 و کمترین زمان پاسخ 42 ثانیه برای غلظت ppm 3600 است.
واژه‌های کلیدی: نانوذرات اکسید روی، ناخالصی آلومینیوم، حسگری گازی، حلال گرمایی.
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