سنتز و بررسی ویژگی‌های خواص ساختاری، نوری و مغناطیسی نانوکامپوزیت‌های ZnO/Fe2O3

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فیزیک و مهندسی هسته‌ای دانشگاه صنعتی شاهرود، شاهرود، ایران

چکیده

در این پژوهش، نمونه‌های پودری ZnO، α-Fe2O3 و نانوکامپوزیت‌های ZnO/Fe2O3 با نسبت وزنی  ZnO به  Fe2O3  برابر با  (5/0: 1)، (1:1) و (1:2) به روش گرمابی تهیه و سپس ویژگی­های ساختاری­، نوری و مغناطیسی آنها بررسی شد. نتایج بررسی الگوهای پراش پرتو (XRD) نمونه­‌ها تشکیل ساختار ششگوشی اکسید روی و اکسید آهن را تائید کردند. بررسی طیف جذبی نمونه­‌های سنتز شده نشان داد که نانوکامپوزیت ZnO/Fe2O3 جذب را در ناحیه مرئی افزایش داده و از این رو مقدار گاف نواری آن نسبت به اکسید روی کاهش و نسبت به اکسید آهن افزایش می ‌یابد. تصاویر میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM) نشان دادند که نانوذرات کروی Fe2O3 روی سطح نانوورقه­های ZnO قرار گرفته‌اند. نتایج مغناطیس سنج نمونه ارتعاشی (VSM) نشان دادند که ZnO خالص دارای ویژگی­ غالب دیامغناطیسی و -Fe2O3α دارای ویژگی­های فرومغناطیس نرم هستند و در نانوکامپوزیت‌های تهیه شده، با افزایش غلظت Fe2O3 مقدار مغناطش افزایش می‌یابد. به­طور کلی نتایج این تحلیل­ها نشان دادند که اندازه ذرات، ویژگی­های نوری و ویژگی­های مغناطیسی نانوکامپوزیت­های ZnO/Fe2O3 به شدت به غلظت Fe2O3-α بستگی دارند.     

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis and study of structural, optical and magnetic properties of ZnO/Fe2O3 nanocomposites

نویسندگان [English]

  • maaedeh saiedi
  • mohammad e. ghazi
  • morteza izadifard
Physics Department, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

In this study, ZnO, α-Fe2O3 and ZnO/Fe2O3 nanocomposites powders with weight ratios of (1:0/.5), (1: 1) and (1: 2) were prepared using hydrothermal method and their structural, optical and magnetic properties were investigated. The results obtained from analysis of the XRD patterns confirmed formation of the hexagonal structures for ZnO and Fe2O3. The absorption spectra of the synthesized samples showed that the absorption in the visible region increases for ZnO/Fe2O3 nanocomposite and its band gap value reduces (increases) in comparison to the zinc oxide (iron oxide). FESEM images showed that Fe2O3 spherical nanoparticles are located on the surface of the ZnO nano-sheets .The results obtained from magnetic studies by VSM revealed that ZnO has a diamagnetic property and α-Fe2O3 shows soft ferromagnetic behavior and for the nanocomposites, the magnetization values increase with increasing the Fe2O3 concentration. In general, the results show that the particle size, optical property and magnetic property of the ZnO/Fe2O3 nanocomposites strongly depends on the concentration of Fe2O3.

کلیدواژه‌ها [English]

  • hydrothermal method
  • ZnO/Fe2O3 nanocomposites
  • optical property
  • magnetic property
  • structural property

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  • تاریخ دریافت: 30 بهمن 1401
  • تاریخ بازنگری: 26 اسفند 1401
  • تاریخ پذیرش: 28 فروردین 1402

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