Fig 1.
Representative schematic of GO-Fe3O4 conjugates formation.
Fig 2.
TEM of a) superparamagnetic Fe3O4 NPs, b) graphene oxide, c) GO-Fe3O4 conjugates and d) image of GO-Fe3O4 conjugates manipulated in solution by the of a magnetic field.
Fig 3.
a) 1/T1 vs iron concentration [Fe] of GO-Fe3O4 conjugates and b) 1/T2 vs [Fe] of GO-Fe3O4 conjugates, the bars represent the standard deviation.
Fig 4.
a) Fluorescence spectra of GO and GO-Fe3O4 conjugates b) pH fluorescence dependence of GO-Fe3O4 conjugates.
Fig 5.
a) Images of GO-Fe3O4 fluorescence in HeLa cells at different transfection times and b) GO internalization over time assessed by average normalized intensity per unit emissive area of GO-Fe3O4 fluorescence in HeLa cells.
Fig 6.
a) Images of GO-Fe3O4 emission in green (550 nm) and red (635 nm) in healthy HEK-293 versus cancer HeLa and MCF-7 cells b) Comparison of intracellular vs extracellular green/red ratios in healthy vs cancer cells.
Fig 7.
a) Cell viability of HeLa cells subject to: GO-Fe3O4 (black squares), DOX-GO-Fe3O4 (blue squares) and DOX (red squares) and b) GO-Fe3O4 internalization fluorescence imaging in HeLa cells.