مجله فصل مشترک ها، لایه های نازک و سیستم های با بعد کم
مطالعه خواص فیزیکی کادمیم تلوراید (200): سنتز نانوذرات و رشد لایه نازک
نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه فیزیک، دانشکده علوم، واحد یادگار امام خمینی شهر ری، دانشگاه آزاد اسلامی، تهران، ایران.
2 گروه فیزیک، دانشکده علوم، واحد یادگار امام خمینی شهر ری، دانشگاه آزاد اسلامی، تهران، ایران
چکیده
در این کار، نانوذرات کادمیوم تلوراید به روش سونوشیمیایی سنتز شده و سپس لایه های نازک با ضخامت هایی در حدود 100 نانومتر به روش تبخیر حرارتی در دمای بستر 200 درجه سانتیگراد و فشار خلاء5- 10×2 میلی بار بر روی زیرلایه های شیشه لایه نشانی شدند. سونوشیمیایی یکی از بهترین روشها برای سنتز نانو مواد با اندازه ذرات خیلی کوچک است. پس از سنتز و لایه نشانی، لایه-های تهیه شده درون دستگاه های پراش پرتو ایکس (XRD)، طیف سنجی فرابنفش- مرئی (UV-Vis) و میکروسکوپ الکترونی روبشی (SEM) قرار گرفتند تا ساختار، خواص اپتیکی و مورفولوژی سطح آنها مطالعه و آنالیز شود. مطالعه الگوهای XRD نشان می دهد لایه های رشدیافته پلی کریستال با ساختار مکعبی دارای جهت گیری ترجیحی (200) می باشند. اندازه نانو ذرات سنتز شده و اندازه بلورینگی لایه نازک رشد یافته بر روی شیشه در راستای ترجیحی (200) به ترتیب 16 و 10/65 نانومتر بدست آمد. طیف های جذب نور از نانوذره و لایه نازک بدست آمده از طیف سنجی UV-Vis در محدوده طول موج 600-1600 نانومتر نشان دهنده افزایش مقدار جذب نور پس از لایه‌نشانی است. گاف انرژی اپتیکی از 1/48 الکترون ولت مربوط به نانو ذرات به 1/51 الکترون ولت مربوط به لایه رشدیافته افزایش می یابد. تصاویر مورفولوژی گرفته شده در مقیاس 500 نانومتر از نانو ذرات و سطح لایه نازک، همگنی و یکنواختی هر دو را نشان می دهد.
کلیدواژه‌ها
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