کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5402143 | 1392727 | 2011 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Post annealing immersion: A new technique for studying rare earth ions in porous materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A novel technique is introduced for studying how rare earth ions are incorporated into the matrix of porous materials. Tb3+-doped silica sol-gel is annealed to form porous glass and immersed in an aqueous Gd(NO3)3 solution. Re-heating removes the liquid and deposits Gd3+ ions on the internal pore surfaces. Spectroscopic investigation of Gd3+âTb3+ energy transfer yields information about the location of Tb3+ dopant ions relative to pore surfaces. Results from post-annealing immersion experiments indicate that most Tb3+ dopant ions are close to pore surfaces when sol-gel glass is annealed to 700 °C. The observed energy transfer decreases with higher annealing temperatures, indicating that Tb3+ dopants in densified regions are isolated from Gd3+ ions deposited on pore surfaces. Al3+ co-doping affects both the overall sample density and the degree of Gd3+âTb3+ interaction in post-annealing immersion samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 131, Issue 3, March 2011, Pages 453-456
Journal: Journal of Luminescence - Volume 131, Issue 3, March 2011, Pages 453-456
نویسندگان
K.E. Arpino, A.J. Silversmith, D.M. Boye, K.R. Hoffman,