Figure 4

SEM images of 6O-MWCNTs (a), pure Fe3O4 (b), and 6O-MWCNTs@Fe3O4 (c) and TEM images of MWCNTs (d), 6O-MWCNTs (e), and 6O-MWCNTs@Fe3O4 (f).

SEM images of 6O-MWCNTs (a), pure Fe3O4 (b), and 6O-MWCNTs@Fe3O4 (c) and TEM images of MWCNTs (d), 6O-MWCNTs (e), and 6O-MWCNTs@Fe3O4 (f).