کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1266991 972311 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sonochemical synthesis of TiO2 nanoparticles on graphene for use as photocatalyst
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Sonochemical synthesis of TiO2 nanoparticles on graphene for use as photocatalyst
چکیده انگلیسی

Using ultrasonication we succeed in a controlled incorporation of TiO2 nanoparticles on the graphene layers homogeneously in a few hours. The average size of the TiO2 nanoparticles was controlled at around 4–5 nm on the sheets without using any surfactant, which is attributed to the pyrolysis and condensation of the dissolved TiCl4 into TiO2 by ultrasonic waves. The photocatalytic activity of the resultant graphene–TiO2 composites containing 25 wt.% TiO2 is better than that of commercial pure TiO2. This is partly due to the extremely small size of the TiO2 nanoparticles and partly due to the graphene–TiO2 composite structure consisting of homogeneous dispersion of crystalline TiO2 nanoparticles on the graphene sheets. As the graphene in the composites has a very good contact with the TiO2 nanoparticles it enhances the photo-electron conversion of TiO2 by reducing the recombination of photo-generated electron–hole pairs.


► Fine TiO2 particles are embedded into graphene sheets by a sonochemical method.
► The particle size of TiO2 are controlled at around 4–5 nm.
► The resultant graphene–TiO2 composite shows a high photocatalytic performance.
► The advantage of this method: fast, simple, effective and energy efficient.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 18, Issue 5, September 2011, Pages 1082–1090
نویسندگان
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