| Internal structure | Advantage | Disadvantage | ref |
|---|---|---|---|
| Double percolation structure | Low percolation threshold | Conditions are difficult to control | 53 |
| Segregation structure | Lower percolation threshold | High technical requirements | 58 |
| Porous structure | High sensitivity | The preparation process is complex | 50 |
| “Brick-and-mortar” structure | Good mechanical properties | High percolation threshold | 76 |
