Preparation And Properties Of Doped BaTiO₃/ Conductive Polymer Composite Absorbing Materials

The electromagnetic wave absorption material has a wide range of applications inmilitary and civilian areas, and has become a hot research field of national defenseequipments and civil anti-electromagnetic radiation. At present, single absorbing materialshave been difficult to meet the development requirements of the absorption of strong, wideband, thin, light weight, corrosion resistance and low cost. Applying the different absorbingproperties of the materials composite is an effective way to improve the performance ofabsorbing materials. Barium titanate absorbing materials have the dielectric loss-based,including the conductance loss, relaxation polarization loss and the resonant loss. In this paper,barium titanate with multi-walled carbon nanotubes and conductive polymer absorbingmaterials composites separately, and these composits combine a variety of absorbingmechanisms of different absorbing materials to overcome the higher density, narrow-band,poor absorbing performance shortcomings.Firstly, tetragonal barium titanate and gadolinium-doped barium titanate were preparedby sol-gel; Polypyrrole with a variety of morphologies was synthesized by in situpolymerization, studying the influence of acid and oxidant on the morphology and propertiesof polypyrrole. And the best absorbing performance polypyrrole of the network separatelywith two kinds of barium titanates compounded, PPy/BaTiO3prepared by in situ synthesisthat the polypyrrole coated barium titanate and Gd-doped BaTiO3/PPy composite materialsprepared by ball milling. Then the composite Ba1-xLaxTiO3/MWCNTs of barium titanatecoated multi-walled carbon nanotubes was synthesized by solvothermal. Phases of products,morphology and microwave absorbing properties were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR), and vector network analyzer.The results showed that, relative to single absorbing materials, the maximum loss valueof the composite absorbing materials and absorption bandwidth had a larger increase, showingthe superior absorbing performance.