Preparation and electromagnetic wave absorption of flower-like ZnO-CoFe 2 O 4 nanotube bundles composites

Flower-like ZnO-CoFe 2 O 4 nanotube bundle composites are prepared via two-step crystal growth process in water solution at 90 ℃, the wall thicknesses of the ZnO nanotubes are all about 60 nm, inner diameters of the tubes are all about 350 nm, ZnO nanotubes have been coated with CoFe 2 O 4 nanoparticles, and the sizes of CoFe 2 O 4 nanoparticles are below 40 nm. The thickness of CoFe 2 O 4 coating layer increases with the increase of the content of CoFe 2 O 4 in ZnO-CoFe 2 O 4 composites. By using Flower-like ZnO,flower-like ZnO-CoFe 2 O 4 nanotube bundles and CoFe 2 O 4 nanoparticles as absorbents, and phenolic resin as the binder, their electromagnetic wave absorption properties are investigated, and the results show that the microwave wave absorbing performance is evidently improved compared with that of ZnO nanotube bundles and CoFe 2 O 4 particles. When the content of ZnO is 60%, the maximum reflection loss is 28.3 dB.