Abstract
The three-dimensional (3D) conductive network structures formed by barium titanate/carbon nanotubes incorporated polyaniline were favorable for strengthening electromagnetic absorption capability. Herein, an easy and flexible method consisting of sol-gel technique, in situ polymerization, and subsequent mechanical method have been developed to prepare the barium titanate/carbon nanotubes incorporated polyaniline (CNTs/BaTiO3/PANI or CBP) ternary composites. The dielectric properties and microwave absorption properties of CNTs/BaTiO3/PANI composites were investigated in the frequency range of 2–18 GHz by vector network analyzer. Interestingly, it is found that the CNTs/BaTiO3/PANI composites with 3D conductive network structures presented outstanding electromagnetic absorption properties, which may be attributed to the high impedance matching behavior and improved dielectric loss ability and novel synergistic effect. Additionally, it also can be supposed that the “geometrical effect” of composite was more beneficial to absorbing the incident electromagnetic wave. The CNTs/BaTiO3/PANI composite (the mass ratio of CNTs/BaTiO3to PANI is 2 : 3) exhibits the best microwave absorption properties, of which the minimum reflection loss value can reach −30.9 dB at 8 GHz and the absorption bandwidth with a reflection loss blew −10 dB ranges from 7.5 to 10.2 GHz.
Highlights
Arising from the rapid development of information technology, the military stealth technique has attracted increasing attention owning its application in the modern warfare
The well conductivity of carbon nanotubes used as microwave absorbing material has the shortcoming of poor impedance matching
Zhu et al [10] found that MWCNT covered with BaTiO3 possessed better microwave absorbing properties than the pure MWCNTs in the frequency range 11–15 GHz
Summary
Arising from the rapid development of information technology, the military stealth technique has attracted increasing attention owning its application in the modern warfare. Electromagnetic interference has greatly threatened human health and disturbed all contemporary electrical and electronic systems from daily life to space exploration [1, 2] It is urgent demand for a high-performance microwave absorbing material with low density, tiny thickness, strong wave absorption, and broad bandwidth [3]. PANI has the potential application in the field of energy storage, energy saving, and anticorrosion [14] It has become an ideal choice as a component of microwave absorber to achieve a perfect impedance matching. It is anticipated that the CNTs/BaTiO3/PANI composite shows excellent microwave absorbing properties, owing to high impedance matching, enhanced synergistic effect, and improved dielectric loss. It is worth mentioning that the 3D conductive network structures of CNTs/BaTiO3/PANI composite with greater microwave absorption properties may be affected by the “geometrical effect.”
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