Table 1 FeCl3 etching time of the contact angle and surface roughness
| FeCl3 etching (min) | SEM image | Wettability | Contact angle (˚) | Roughness, Ra (nm) |
|---|---|---|---|---|
| 1 |
|
| 74.2 | 98 |
| 3 |
|
| 49.8 | 142 |
| 5 |
|
| 22.6 | 178 |
