Fig. 5From: A Resumable Fluorescent Probe BHN-Fe3O4@SiO2 Hybrid Nanostructure for Fe3+ and its Application in Bioimaging a Fluorescence intensities of BHN-Fe3O4@SiO2 and Fe3+-BHN-Fe3O4@SiO2 at various pH values at room temperature. CH3CN/H2O 1:1, λ ex = 415 nm. b Bright field image and fluorescence image of the HeLa cells with BHN-Fe3O4@SiO2. (c) Bright field image and fluorescence image of the HeLa cells with BHN-Fe3O4@SiO2 and Fe3+ Back to article page