کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1659076 1008368 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Laser-induced enhancement of the surface hardness of nanoparticulate TiO2 self-cleaning layer
چکیده انگلیسی

We here report that the abrasion resistance of nanoparticulate TiO2 self-cleaning layers can be highly enhanced without a considerable loss of photocatalytic capability. TiO2 coating layers solution-deposited onto the glass substrate were irradiated by a pulsed ultraviolet (UV) laser at 355 nm, which modified the surface morphologies via laser-induced local melting of TiO2 nanoparticles. The surface hardness, measured by pencil scratch test, improved with increasing laser power (P). While an unmodified TiO2 layer revealed a hardness of 6B, it increased to 2H after the surface was irradiated at P = 0.3 W. Almost all of the stearic acid deposited on an unmodified sample disappeared after UV exposure for 12 h. The photocatalytic decomposition was slowed down on laser-irradiated TiO2 surfaces and this is attributed to the reduction of specific surface areas as a result of the morphological modifications. However, a TiO2 layer hardened to 2H still exhibited fairly good photocatalytic activity, decomposing more than 75% of the stearic acid after exposure for the same duration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 205, Issue 2, 15 October 2010, Pages 372–376
نویسندگان
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