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Fig. 3 | Nanoscale Research Letters

Fig. 3

From: A Resumable Fluorescent Probe BHN-Fe3O4@SiO2 Hybrid Nanostructure for Fe3+ and its Application in Bioimaging

Fig. 3

a Fluorescence responses of BHN-Fe3O4@SiO2 with various cations. Excitation wavelength was 415 nm. Spectra were recorded every 2 min after adding metal ions. b Competition of Fe3+-BHN-Fe3O4@SiO2 towards cations. Fluorescent emission change of BHN-Fe3O4@SiO2 (0.2 g/L) upon addition of metal ions (each metal ion is 5 × 10−5 M) in CH3CN/H2O 1:1 (HEPES buffer pH 7.36) at room temperature. c Time responses of BHN-Fe3O4@SiO2 with Fe3+ and Cu2+. d UV-Vis titrations of BHN-Fe3O4@SiO2 (0.2 g/L) with Fe3+. e Fluorescence titration of BHN-Fe3O4@SiO2 (0.2 g/L) with Fe3+. Inset: the fluorescence intensities at 518 nm at various concentrations of Fe3+. f Job’s plot of BHN-Fe3O4@SiO2 with Fe3+

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