کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1459930 989599 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and photoactivity of anatase porous single crystals with different pore sizes
ترجمه فارسی عنوان
سنتز و عکسبرداری از کریستال های متخلخل آناتاز با اندازه های مختلف منافذ
کلمات کلیدی
آناتاز، کریستال متخلخل، اندازه منفذ، عکسبرداری
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

In this paper, anatase porous single crystals (PSCs) with different pore sizes were hydrothermally synthesized by using silica spheres as template. The products exhibit uniform porous structure which is consistent with silica template dimensions. Sharp Laue diffraction patterns, uniform lattice frings in different regions and occurrence of partial porous single crystal unequivocally prove monocrystalline nature of the samples. All PSC samples display high degree of crystallinity. Specific surface area increases with decrease of pore size and adsorption–desorption isotherms of type IV further confirm porous structure of PSCs. All samples show the strong absorption of ultraviolet light, the extent of which increases with decrease of pore size. Photoluminescence intensity decreases as pore size decreases, however, the intensity for S1 sample with minimum pore size is somewhat higher than that of S2. Photocatalytivity tests show the similar results which may be attributed to the combined effect of the surface active sites, the exchange between species in holes and those outside of PSCs, and electron mobility in framework. Moreover, the “seeding template-crystallization” mechanism for PSCs formation was discussed in detail. Based on these results, PSCs anatase with different purposes can be achieved by means of precise adjust for pore dimension and surface area.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 41, Issue 9, Part B, November 2015, Pages 11936–11944
نویسندگان
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