Preparation of polypyrrole/Co_(x)Mo_(y)O_(z)composite and its microwave a bsorption performance

聚吡咯/钴钼氧化物的制备及微波吸收性能研究

The present work combines polypyrrole with cobalt molybdenum oxide using an in situ surface growth method to adjust impedance matching and explore the microwave absorption performance of the composite material.The complex dielectric constant and magnetic permeability of the samples are measured in the frequency range of 2 to 18 GHz using a vector network analyzer,and their reflection loss(RL)value is investigated.The results show that the obtained PPy/Co_(x)Mo_(y)O_(z)composite exhibits excellent absorption performance at 17.68 GHz under a matching thickness of 2.0 mm,with an RL_(min)of-46.02 dB and an effective absorption bandwidth of 4.08 GHz.The excellent absorption performance can be attributed to the combined effect of multion loss mechanisms,including conduction loss,interface polarization,dipole polarization and eddy current loss.

采用表面原位生长法,将具有高磁导率的钴钼氧化物与聚吡咯复合,用以调节阻抗匹配,并探究复合材料的微波吸收性能。结果表示,所得聚吡咯/钴钼氧化物显示出优异的吸波性能,在匹配厚度为2.0 mm,频率为17.68 GHz处RL_(min)可达到-46.02 dB,有效吸收带宽达到4.08 GHz。聚吡咯/钴钼氧化物的吸波性能可归功于电导损耗、界面极化、偶极极化和涡流损耗等多种损耗机制的共同作用。