902538.fig.002a
(a)
902538.fig.002b
(b)
902538.fig.002c
(c)
Figure 2: (a) TEM image of self-assembled monolayer Fe3O4 nanocrystals; (b) SEM image of assembled multilayer Fe3O4 nanocrystals; (c) SEM image of RD Fe3O4 nanocrystals; the inset is model of RD enclosed by twelve (110) planes [6, 19].