Size (nm)

TEOS (mL)

NH3H2O (mL)

Ethanol (mL)

H2O (mL)

Temperature (˚C)

Time (h)

70 [27]

13.2

33

440

-

60

5

260 [12]

13.2

33

440

8.8

RT

17

500 [28]

10

22

100

-

RT

8