Shape-Evolution and Growth Mechanism of Fe₃O₄ Polyhedrons

Figure 4

SEM images of samples obtained using different N₂H₄⋅H₂O dosages at pH = 9 in the solution: (a) 0.8 mL, (b) 1.1 mL, (c) 1.5 mL, and (d) 2.5 mL.

(a)

(b)

(c)

(d)