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. 2017 Mar 8;7:44153. doi: 10.1038/srep44153

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UV−Vis spectra of (a) Fe₃O₄@C and (b) Fe₃O₄@C@PMOF nanocomposites. Inset: the amplification of the part spectrum. (c) The excitation and fluorescence spectra (excitation at 553 nm) of Fe₃O₄@C@PMOF aqueous solution. (d) T₂-weighted MR images of Fe₃O₄@C@PMOF at different concentrations of Fe and the plot of 1/T₂ over Fe concentration of Fe₃O₄@C@PMOF nanocomposites. The slope indicates the specific relaxivity (r₂).