Fig. 3From: Fabrication of NaYF4:Yb,Er Nanoprobes for Cell Imaging Directly by Using the Method of Hydrion Rivalry Aided by Ultrasonic a The TGA curves of NaYF4:Yb,Er NPs. a OA-capped samples, b OA-free samples. b FTIR absorption spectra of as-prepared NaYF4:Yb, Er NPs before and after removing OA layer. a OA, b OA-capped samples, c OA-free samplesBack to article page