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Fe5C2@Fe3O4 NPs for MRI. (a) Schematic illustration of Fe5C2@Fe3O4 NPs with Ph-responsive Fe2+ release, ROS generation, and T2/T1 signal-conversion abilities. (b,c) pH-dependent MRI mode switching of PEG/Fe5C2@Fe3O4 nanoparticles. (d) Representative T2—weighted MR images. (e) Representative T1—weighted MR images. Reproduced with permission from Ref. [99]. Copyright © 2019 American Chemical Society. ** p<0.05
