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. 2021 Apr 7;19:98. doi: 10.1186/s12951-021-00848-x

Fig. 1.

Fig. 1

Synthesis and morphology of Ru@SiO2-PA. a SEM images and TEM images b of Ru@SiO2-PA. c Hydrodynamic diameters and distributions of Ru@mSiO2-PA. d Photographs of 1 mg/ml SiO2-PA (I) and Ru@SiO2-PA (II) under ultraviolet light. e Fluorescence emission spectra of PA, SiO2, Ru and Ru@SiO2-PA. f Variation of zeta-potentials of Ru@SiO2 and Ru@SiO2-PA during the coating process. g EDS spectrum of Ru@SiO2-PA. h Element mapping of Ru@SiO2-PA