In this work, a polyaniline (PANI) fibers/Co 0.2 Ni 0.4 Zn 0.4 Fe 2 O 4 (CNZF) composite (mass ratio of PANI to CNZF is 1:1) with a novel urchin-like structure was successfully fabricated through interfacial polymerization. The CNZF was synthesized by the sol-gel method, and whereafter, the PANI fibers were grafted onto the CNZF surface through in-situ polymerization. Structural and morphological properties were systematically investigated by using field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectra (FTIR). In the frequency range of 2–18 GHz, the microwave absorption properties of samples were investigated by using vector network analyzer (VNA). The results demonstrated that the microwave absorbing capability of the PANI/CNZF composite was superior to the pure CNZF or PANI. For the PANI/CNZF composite, its optimal absorption peak reached −41.9 dB at 10.48 GHz with a 2.8 mm thickness and the effective absorption bandwidth (R L < −10 dB) was 3.76 GHz. Moreover, the maximum effective bandwidth of PANI/CNZF reached 5.24 GHz (12.66–17.90 GHz) with a thinner thickness of 1.9 mm. On account of advanced impedance matching and increased interfacial effects, the PANI/CNZF composite possessed excellent microwave absorption properties and can be used as absorbers with strong absorption, extended absorbing bandwidth, and thin thickness.
Liu Pei-Jiang,Yao Zheng-Jun,Ng Vincent Ming Hong,Zhou Jin-Tang,Yang Zhi-Hong,Kong Ling-Bing
Microwave absorption properties of spherical NiO particles and Co 0.2 Ni 0.4 Zn 0.4 Fe 2 O 4 (CNZF) ferrites with single-layer and double-layer absorbers were studied in the frequency range of 2–18 GHz. The spherical NiO particles were synthesized by using a hydrothermal process, while the CNZF powders were prepared by using a sol–gel autoignition method. The double-layer absorbers, composed of 30 wt% NiO as matching layer and 30 wt% CNZF as absorption layer, with a total thickness of 3.2 mm, exhibited a maximum reflection loss ( R
L ) of –67.0 dB at 9.2 GHz and an effective absorbing bandwidth below –10 dB to be 3.9 GHz from 7.0 to 10.9 GHz. The excellent microwave absorption performance of the double-layer absorbers should be ascribed to the high impedance matching ratio, the great microwave attenuation capability, and well-coupled layer.
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