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TEM images of (a) as-synthesized oleate-capped NaYF4:Yb,Er NPs drop-cast from chloroform dispersion; phase transferred in water via (b) PEG-oleate bilayer formation; (c) ligand free (bare NPs), and (d) covalently attached PEG-NPs. Insets of the particles show the hydrodynamic size distribution obtained from DLS measurement.
