Fig. 1From: Fabrication of NaYF4:Yb,Er Nanoprobes for Cell Imaging Directly by Using the Method of Hydrion Rivalry Aided by UltrasonicThe schematic diagram of oleate ligand removed from the surface of NaYF4:Yb,Er NPs in the acidic ethanol (a) and the water-soluble new-UCNPs coupled with amino acid (b) in aqueous solutionBack to article page