بررسی ویژگی‌های ساختاری و اپتیکی نانوذرات دی‌اکسید تیتانیوم آلاییده با کروم تهیه شده به روش سل ژل در دماهای بازپخت متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه کوثر بجنورد

2 دانشگاه بجنورد

چکیده

گسترش پاسخ نوری فوتوکاتالیزور‌های بر پایه دی‌اکسید تیتانیوم به ناحیه مرئی با بهره بالا در تمام گستره جذبی طیف الکترومغناطیسی نور، یکی از اهداف پژوهشی سال‌های اخیر است. در این پژوهش به منظور افزایش جذب نوری نانوذرات دی‌اکسید تیتانیوم به روش سل-ژل سنتز و با کروم آلاییده شده و در دماهای مختلف 400، 600 و oC 800 بازپخت شدند. با افزایش دمای بازپخت از 400 به oC 800 همراه با تغییر فاز نمونه‌ها از آناتاز به روتیل، اندازه ذرات نیز افزایش یافت. در اغلب پژوهش‌ها از فاز آناتاز برای بررسی فعالیت‌های فوتوکاتالیزوری استفاده می‌شود و به عنوان فاز مطلوب دی ‍‌اکسید تیتانیوم برای کاربردهای فوتوکاتالیزوری معرفی شده است، در حالی که با توجه به افزایش جذب نوری که در طیف بازتاب پخشی فاز روتیل در این پژوهش دیده شد و با توجه به ویژگی‌های ساختاری روتیل، این فاز دی‌اکسید تیتانیوم نیز می‌تواند به عنوان گزینه مناسبی برای کاربردهای فوتوکاتالیزوری پیشنهاد شود.    

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of structural and optical properties of Cr doped TiO2 synthesized at different annealing temperature by analyzing the XRD patterns and DRS spectroscopy

نویسندگان [English]

  • mahboobeh Yeganeh 1
  • Fatemeh Badieian Baghsiyahi 1
  • maliheh Mousavi 2
1
2
چکیده [English]

Extension of the optical response with the high efficiency in visible region of the solar light spectrum is one of the research goals of the photocatalysts based on TiO2. In this work, Cr doped TiO2 was synthesized by sol-gel method at different annealing temperature of 400, 600 and 800 oC in order to increase the optical absorption of TiO2. Upon increasing the annealing temperature, the anatase transformed to rutile while the size of the nanoparticles increased. Anatase was often used for investigation of photocatalytic activities and has been introduced as the desired phase of TiO2 for the photocatalytic applications. According to the observed increase in the optical absorption of the rutile by diffuse reflectance spectroscopy (DRS) and considering the structural properties of rutile, this phase of TiO2 can also be considered for photocatalytic activities and applications.

کلیدواژه‌ها [English]

  • Cr doped TiO2
  • XRD
  • TEM
  • Diffuse reflectance spectroscopy

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مجله بلورشناسی و کانی شناسی ایران
دوره 27، شماره 1 - شماره پیاپی 73
فروردین 1398
صفحه 221-230

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سابقه مقاله

  • تاریخ دریافت: 01 اردیبهشت 1397
  • تاریخ بازنگری: 07 تیر 1397
  • تاریخ پذیرش: 10 مرداد 1397

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