Fig. 2
Characterization of Ru@SiO2-PA. a UV–vis absorption spectra of PA, SiO2 and SiO2-PA. b FTIR spectrum of PA, c XRD spectrum of Ru@SiO2-PA. SiO2 and SiO2-PA. Si2P d and Ru3P e XPS spectrum of Ru@SiO2-PA. f Relative PA release of Ru@SiO2-PA at pH = 7.4/6. g Cumulative H2O2 production in DMEM medium (10% serum) in the presence of PA. h Fluorescence intensity change of 2-hydroxyterephthalic acid as a function of time after incubation with PA (6 μg/ml), Fe3O4@mSiO2 (14 μg/ml), or Fe3O4@mSiO2-PA (20 μg/ml) in 10% serum-containing medium. (I) The relative size change of Ru@SiO2-PA at different storage time (1–7 days)