Comparative studies on microwave absorbers prepared from biomass materials.
| Absorber | Content (wt%) | Min. RL (dB) | Thickness (mm) | <−10 dB bandwidth (GHz) | Ref. |
|---|---|---|---|---|---|
| Nano-porous carbon | 30 | −42.4 | 2.0 | 1.76 | 18 |
| Heteroatom-doped carbon | 30 | −44.6 | 1.68 | 2.2 | 20 |
| Carbon nanofiber | 80 | −36 | 2.0 | 5.4 | 56 |
| Ni(OH)2/carbon | 50 | −23.6 | 6.0 | 2.0 | 4 |
| Wood-based absorber | — | −68.3 | 4.28 | 6.13 | 57 |
| Porous CoxNiy/SA-derived carbon | 50 | −49.08 | 1.4 | 6.68 | 55 |
| SA–Ni–(Fe3O4/CNT) | 25 | −32 | 2.0 | 3.2 | 6 |
| Dopamine-derived cavities/Fe 3 O 4 /SA-derived carbon | 35 | −50.8 | 1.5 | 3.5 | This work |