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. 2013 Mar 21;3(4):282–288. doi: 10.7150/thno.5523

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© Ivyspring International Publisher. This is an open-access article distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by-nc-nd/3.0/). Reproduction is permitted for personal, noncommercial use, provided that the article is in whole, unmodified, and properly cited.

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TEM images of (a) ~30nmAu/~25nmSiO_2; (b) ~30nmAu/~25nmSiO₂/~12nmY₂O₃:Yb³⁺, Er³⁺; (c) ~30nmAu/~30nmSiO₂; (d) ~30nmAu/~30nmSiO₂/~12nmY₂O₃:Yb³⁺,Er³⁺; (e) ~30nmAu/~40nmSiO₂; (f) ~30nmAu/~40nmSiO₂/~12nmY₂O₃:Yb³⁺,Er³⁺; (g) ~30nmAu/~45nmSiO₂; and (h) ~30nmAu/~45nmSiO₂/~12nmY₂O₃:Yb³⁺,Er³⁺.