Comparison of single-layer and bilayer microwave absorbents with the present research.
| Materials | Thickness/mm | RL/dB | Frequency/GHz | Bandwidth (≤10 dB)/GHz | Ref. |
|---|---|---|---|---|---|
| PS-PVP-Fe3O4- PEG (one layer) | 1 | −11 | 10 | 0.3 | 89 |
| PS/TGO/Fe3O4 (one layer) | — | −35 | 11.9 | 4 | 90 |
| Ni@MWCNT/PS (one layer) | 6 | −33 | 2.7 | 0.9 | 91 |
| HNTs/polypyrrole/Fe3O4 (one layer) | 3 | −31.2 | 10.58 | 4 | 37 |
| HNTs/Fe3O4/C (one layer) | 4.56 | −51.5 | 11 | — | 92 |
| PBOPy/PPy/Fe3O4 (one layer) | 3.5 | −23.3 | 13 | 2.2 | 93 |
| PEDOT/PSS/HNTs (one layer) | 4.5 | −16.3 | 8.4 | 2 | 94 |
| Fe3O4/carbon@Fe3O4/rGO (bilayer) | 2 | −52 | 9.4 | 4 | 95 |
| LAS@LAS-SiC (bilayer) | 4 | −42.8 | 10.5 | 3.5 | 96 |
| Fe3O4/HNT-PS (current work) | 4 | −26.9 | 12 | 1.27 | — |