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. 2014 Dec 12;6(3):1747–1753. doi: 10.1039/c4sc03080j

Fig. 2. (a) Schematic diagram of the two synthetic routes to RUMSNs. (b–g) TEM images of the products: (b) UCNPs; (c) UCNPs@SiO2; (d) UCNPs@SiO2@mSiO2; (e) ligand-free UCNPs; (f) UCNPs@mSiO2; (g) RUMSNs. The core, shell and overall sizes of RUMSNs are about 19, 10 and 47 nm, respectively.

Fig. 2