Fabrication of N-Doped rGO/Mn–Co Ferrite Composites for Broadband Microwave Absorption

Abstract

The development of wideband, lightweight, thinly matched electromagnetic absorbing materials with high absorption capacity is crucial for addressing the issues of electromagnetic radiation and pollution. In this study, NrGO/Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 composites were effectively produced using a simple two-step technique. The structural study revealed a painstakingly constructed entanglement architecture made up of crumpled NrGO and Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 microspheres inside the NrGO/Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 composites as it was manufactured. The NrGO/Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 composites absorb microwaves substantially better than pure Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 , which has a reflection loss (RL) of −10 decibels across all tested frequencies. The effective absorption bandwidth of 2.54[Formula: see text]mm thick NrGO/Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 composite (30[Formula: see text]wt.%) was 6.4[Formula: see text]GHz, spanning from 10.07[Formula: see text]GHz to 16.47[Formula: see text]GHz. The optimal RL at a frequency of 12.9[Formula: see text]GHz was notably improved to −42.4[Formula: see text]dB. This remarkable capability of absorbing microwaves is mainly associated with the joint effects of interfacial polarization, magnetic particle resonance and the capacitor effect exhibited by NrGO and Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 . The results show that NrGO/Mn[Formula: see text]Co[Formula: see text]Fe 2 O 4 composites can be used as efficient electromagnetic wave-absorbing materials.