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(a) Photoluminescence spectra of hydrophobic QDs in organic solvent and water-soluble ZW-MFNPs; (b) R2 parameters of ZW-MFNPs vs (Mn + Fe) concentration (the slope r2 of each curve = R2/[(Mn + Fe) concentration]). The inset image is a representative magnetic resonance image of ZW-MFNPs and ZW-MNPs. ZW-MNPs were fabricated as a reference for magnetic resonance imaging.
