Abstract
A coating consisting of Fe3O4/La2O3 mixed particles has been prepared and applied to the surface of carbonaceous nonwoven (CNW) using immersion and calcination processes to improve its electromagnetic (EM) wave absorption property. The surface phase composition, surface morphology, and surface chemical composition of the CNW and the effect of the coating preparation parameters on its EM wave-absorbing property were investigated. The results revealed that the coating was uniformly deposited on the surface of CNW through immersion and calcination. Moreover, the EM wave-absorbing property could be regulated by adjusting the molar mass ratio of FeCl3 to LaCl3, total molar mass, and calcination temperature. The modified CNW obtained with a molar mass ratio of FeCl3 to LaCl3 of 8:2, total molar mass of 0.625 mol/L, and calcination temperature of 750°C showed excellent EM wave-absorbing property with an effective bandwidth of 5.9 GHz and lowest reflection loss of −31.3 dB for a thickness of 3 mm.
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