Journal
DIAMOND AND RELATED MATERIALS
Volume 111, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.108219
Keywords
Lignin-based carbon; Polyaniline; Composite; Microwave absorption
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Funding
- Anhui Natural Science Foundation [1808085QB54]
- China Postdoctoral Science Foundation [2017M621989]
- Anhui Province Postdoctoral Science Foundation [2017B216]
- Research Fund Anhui University of Science and Technology [ZY534]
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The study shows that lignin-based carbon/PANI composites exhibit excellent microwave absorption performance, suitable for both C-band and X-band, with a broader absorption bandwidth and higher absorption intensity compared to untreated lignin.
Lignin and polyaniline (PANI) as raw materials were pretreated and calcined to prepare a lignin-based carbon/ PANI composite microwave absorbent. The microscopic, structural, and microwave absorption performance of lignin-based carbon/PANI composites were investigated using X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and vector network analyzer. Results show that the optimized reflection loss (RL) of the lignin-based carbon/PANI composites is -50.96 dB, its matching thickness is 3.09 mm, and its effective absorption frequency range is 6.8-10.8 GHz (RL <-10 dB), covering C-band and X-band. Compared with untreated lignin, lignin-based carbon/PANI composites possess broader effective absorption bandwidth and higher absorption intensity. The outstanding absorption properties are closely related to the suitable impedance matching and the multiple loss mechanisms. This work can be used as the basis for the design and preparation of lignin-based and PANI polymer composites and serves as a feasible method for the design and synthesis of microwave absorbents with light weight and high performance.
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