Preparation and Electromagnetic Properties of ZnO/Gd2O3 Composite Hollow Microspheres
Using the C/ZnO microspheres synthesized by a hydrothermal method as the precursors,the ZnO hol-low porous microspheres were obtained by a calcination treatment,and then the ZnO/Gd2O3 hollow porous com-posites were successfully prepared via the urea homogeneous deposition and the calcination treatment.The char-acterizations of the morphology,composition,magnetic and electromagnetic properties reveal the influence of the wave absorption properties of the urea and the absorption mechanism of the composite system.The results show that the combination of the magnetic Gd2O3 with the dielectric loss type ZnO into the heterogeneous struc-tures can improve the impedance matching properties.Owing to the dual loss mechanism,heterostructure,and hollow porous structures,ZnO/Gd2O3 exhibits an efficient electromagnetic wave absorption capability.With in-creasing Gd2O3 content,the permeability and matching properties increase,while the dielectric constant and at-tenuation properties decrease.When the amount of urea is 0.5 g,the as-obtained ZnO/Gd2O3-2 exhibits the best microwave absorption performance and the maximum absorption,effective bandwidth and matching thickness are-40.76 dB,7.08 GHz and 3.5 mm,respectively.
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