Figure 3:
TEM images of (a) As-prepared Fe
3
O
4
nanocubes, (b) Fe
3
O
4
/SiO
2
with 1 mL TEOS, (c) Fe
3
O
4
/SiO
2
with 1.5 mL TEOS , (d) Fe
3
O
4
/SiO
2
with 2 mL TEOS and (e) Fe
3
O
4
/SiO
2
with 2.5 mL TEOS, and (f) HRTEM of Fe
3
O
4
/SiO
2
with 2 mL TEOS.
