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 |