Preparation and microwave absorption properties of carbon nanotube-polyaniline/polyvinyl alcohol composite aerogels
To obtain high-performance composite aerogel absorbing materials,high-performance HCNTs-PANI/PVA composite aerogels(HPPA)were prepared by directional freezing and low-temperature in-situ polymerization with helical carbon nanotubes(HCNTs)and polyaniline(PANI)as the absorbing functional agent,and polyvinyl alcohol(PVA)as the matrix.The morphology and structure of the HPPA composite aerogels were characterized by scanning electron microscopy,infrared spectroscopy,Raman spectroscopy,and X-ray diffraction.The electromagnetic parameters and absorbing properties of the HPPA composite aerogels were analyzed by vector network analyzer.The results show that the prepared HPPA composite aerogels exhibit excellent wave absorption performance with a minimum reflection loss of-69.08 dB and effective absorption bandwidth of 4.20 GHz.The good microwave absorption performance of the HPPA composite aerogels is mainly attributed to their directional porous structure and heterogeneous medium interface to form a good impedance matching and multi-polarization synergistic effect.This study provides a new idea for the construction of the high-performance composite aerogel absorbing system.
composite aerogelsdirectional freezinglow temperature in situ polymerizationPANImicrowave absorption properties