Fabrication and absorbing property of microwave absorbers based on BaAl2Fe10O19 and poly(o-toluidine)

BaFe10Al2O19/poly(o-toluidine) (BFA/POT) composite were synthesized by in situ polymerization of o-toluidine in the presence of BaFe10Al2O19 particles. The structure, composition and morphology of the obtained samples were characterized by using XRD, FT-IR, UV–vis spectroscopy, SEM, and TEM techniques. Their electrical conductivity, magnetic property and microwave absorbing property were measured by the four-probe meter, the vibrating sample magnetometer and the vector network analyzer, respectively. The results indicated that BFA particles were coated effectively by POT polymer chains and some interaction between POT chains and BFA particles were existed in the composite. The conductivity and saturation magnetization of BFA/POT composite were smaller than those of pure polymer and pure BFA, respectively. The constitution and film thickness of absorbent had a great effect on its microwave absorbing property. The microwave absorbing properties of the BFA/POT composite were better than those of pure BFA and POT. When optimizing the mass rate of BFA to OT up to 0.3, the composite with the thickness of 2 mm had the minimum reflection loss of −29.16 dB at approximately 14.06 GHz, and the maximum available bandwidth of 9.3 GHz, respectively. The results are shown that these composite could be used as advancing absorption and shielding materials due to their favorable microwave absorbing properties.