902538.fig.003a
(a)
902538.fig.003b
(b)
902538.fig.003c
(c)
Figure 3: (a) TEM images of the chainlike arrays of Fe3O4 hollow nanospheres; (b) SEM image of the hierarchial porous Fe3O4 hollow submicrospheres; (c) SEM and TEM images of the flower-like Fe3O4 superstructures [2022].