ساخت و مشخصه‌یابی نانوذرات دی‌اکسید تیتانیوم آلائیده شده با اتم‌های سریم با روش تخلیه الکتریکی

نویسندگان

1 1. دانشکده علوم پایه، گروه فیزیک، دانشگاه زنجان

2 2. دانشکده علوم پایه، گروه فیزیک، دانشگاه آزاد اسلامی ورامین

چکیده

نانوذرات دی­اکسید تیتانیوم (TiO2) به‌عنوان یک ماده فوتوکاتالیست پرکاربرد شناخته شده ­است. برای بهبود کارایی این نانوذرات باید بازترکیب زوج الکترون– حفره کاهش داده و همچنین میزان جذب به ناحیه مرئی گسترش داده شود. یک روش برای افزایش کارایی این نانوذرات، آلائیدن آنها با عناصر گروه لانتانیدها مانند سریم است. در تحقیق پیش رو نانوذرات TiO2 خالص و آلائیده شده با سریم از روش تخلیه الکتریکی ساخته شدند. تاثیر سریم بر خواص ساختاری، مورفولوژیکی و اپتیکی آنها با آنالیزهای پراش پرتو X (XRD)، میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM)، طیف بازتاب پخشی (DRS) و فتولومینسانس (PL) مورد بررسی قرار گرفت. مطالعه ساختاری پراش پرتوایکس نشان داد که اندازه نانوذرات TiO2 با وجود Ce، تا 7/27 نانومتر کاهش می ­یابد. مورفولوژی سطح نانوذرات نشان داد که یکنواختی نانوذرات در نمونه با ناخالی سریم کاهش می­ یابد. نتایج طیف بازتابش پخشی نشان داد که گاف نواری با وجود سریم تا  24/2 الکترون‌ولت کاهش می­ یابد. نتایج آنالیز فتولومینسانس نشان داد که برای نمونه ناخالص، شدت فتولومینسانس کاسته می‌شود که این باعث کاهش بازترکیب زوج الکترون- حفره و افزایش فعالیت فتوکاتالیستی در نانوذرات می شود.

کلیدواژه‌ها

عنوان مقاله [English]

Preparation and Characterization of Cerium Doped Titanium Dioxide Nanoparticles by the Electrical Discharge Method

نویسندگان [English]

  • A. Jafari 1
  • S. Khademi 1
  • M. Farahmandjou 2
  • A. Darudi 1
  • R. Rasuli 1
1 1. Department of Physics, University of Zanjan, Zanjan, Iran.
2 2. Departments of Physics, Islamic Azad University, Varamin Pishva Branch, Varamin, Iran.
چکیده [English]

Titanium dioxide nanoparticles (TiO2) are known as a widely used photocatalyst. In order to improve the performance of these nanoparticles, the recombination of the electron-cavity pair must be reduced and the absorption rate of the visible region should be expanded. One way to increase the performance of these nanoparticles is using cerium doped TiO2. In the present study, pure and doped titanium dioxide nanoparticles were made by the electrical discharge method. The effect of cerium dopants on the structural, morphological and optical properties were studied by x-ray diffraction (XRD), scanning electron microscopy (FESEM), diffused reflection spectroscopy (DRS), photoluminescence (PL) and infrared fourier transform (FTIR) spectroscopy analyses. XRD analysis revealed that the size of TiO2 nanocrystals was decreased to 7.7 nm. The FESEM morphology of the samples also showed that the uniformity of the Ce doped TiO2 was decreased. Further, the DRS results indicated that the band gap energy of Ce-TiO2 was decreased to 2.24 eV. The photoluminescence results demonstrated that the intensity of PL was reduced for the Ce-TiO2 sample, which reduced the recombination of the electron-hole coupling and increased the photocatalytic activity in the doped sample.

کلیدواژه‌ها [English]

  • titanium dioxide
  • Nanocrystal
  • Electrical discharge method
  • Cerium dopant

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مواد پیشرفته در مهندسی
دوره 38، شماره 2
شهریور 1398
صفحه 83-90

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