کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484331 1510523 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Silica nano-rings and nano-hollows: Preparation and UV photoluminescence emission
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Silica nano-rings and nano-hollows: Preparation and UV photoluminescence emission
چکیده انگلیسی

By annealing fused silica coated with ultra-thin Ag film, silica nano-rings and nano-hollows were prepared on the substrate. The Ag nano-particles attached on the wall of nano-hollows or embedded in silica were confirmed with energy dispersive spectroscopy and transmission electron microscopy. Besides the well-known characteristic stretching bands of silica, three novel stretching bands around 1579, 1320 and 270 cm−1 were found in the annealed Ag-coated silica by Raman scattering spectroscopy, which have been attributed to the O2 in ground state, O–O and metal–oxygen stretching bands, respectively. The formation mechanism of nano-rings and nano-hollows has been discussed based on the experimental results. An ultraviolet photoluminescence emission of 360–370 nm from annealed Ag-coated silica was found when the excitations were 230 nm and 280 nm or longer. The possible photoluminescence emission mechanism has been discussed, which suggests that oxygen excess defects are responsible for the photoluminescence emission, and photoexcitation occurs in the silica as well as in Ag+ ions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 40–41, 15 October 2008, Pages 4562–4566
نویسندگان
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