The design of CoFe₂O₄/PANI interfaces can significantly enhance a material's dielectric loss ability at high frequency. This paper presents a simple method to generate CoFe₂O₄/PANI interfaces to enhance microwave absorption and attenuation at high frequency. Cobalt ferrite nanoparticles were mixed with PANI at various wt.%. X-ray diffraction of nanocomposites indicates that the structure of the core material has a spinel structure and demonstrates the formation of CoFe₂O₄/PANI nanocomposites. The particle size of ferrite and polyaniline powders were measured using transmission electron microscopy. The particle size of CoFe₂O₄ is found to be 20 nm. The saturation magnetization (M_s) of all the nanocomposites were found to be decreasing with decrease of ferrite content, while coercivity (H_c) remained at the value corresponding to pure cobalt ferrite. Because the CoFe₂O₄/PANI interface induces a strong dielectric loss effect, all of these materials achieved broad effective frequency width at a coating layer as thin as 1.9 mm. The complex permittivity (ε′ and ε″) and permeability (μ′ and μ″) were collected by a vector network analyser and the absorbing properties were calculated according to transmission theory. ε′, ε″ and μ″ increases with an increase of PANI, whereas μ′ decreases. The absorption peak shifted to the high-frequency side with PANI. These results showed that a wider absorption frequency range could be obtained by adding different polyaniline content in cobalt ferrite.

CoFe ₂ O ₄ / PANI界面的设计可以显着增强材料在高频下的介电损耗能力。本文提出了一种生成CoFe ₂ O ₄ / PANI界面的简单方法，以增强微波在高频下的吸收和衰减。将钴铁氧体纳米粒子与PANI以各种重量百分比混合。纳米复合材料的X射线衍射表明，芯材料的结构具有尖晶石结构，并证实了CoFe ₂ O ₄ / PANI纳米复合材料的形成。使用透射电子显微镜测量铁氧体和聚苯胺粉末的粒度。CoFe ₂ O ₄的粒径被发现是20 nm。发现所有纳米复合材料的饱和磁化强度（M _s）随着铁素体含量的减少而降低，而矫顽力（H _c）保持在对应于纯钴铁氧体的值。由于CoFe ₂ O ₄ / PANI界面会产生很强的介电损耗效应，因此所有这些材料在厚度仅为1.9 mm的涂层上均实现了宽泛的有效频率宽度。用矢量网络分析仪收集复介电常数（ε ′和ε ”）和磁导率（μ ′和μ ”），并根据透射理论计算吸收性能。ε随着PANI的增加，′，ε ”和μ ”增大，而μ ′减小。吸收峰通过PANI移至高频侧。这些结果表明，通过在钴铁氧体中添加不同的聚苯胺含量，可以获得更宽的吸收频率范围。