Lin Chung-Kwei, Chiou Yuh-Jing, Tsou Sheng-Jung, Chung Chih-Yi, Chao Chen-Chun, Yang Ruey-Bing
Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
Nanomaterials (Basel). 2023 Mar 19;13(6):1100. doi: 10.3390/nano13061100.
The one-pot process, which combines the polymerization of polyaniline (i.e., PANI) with subsequent reduction of iron nanowire (i.e., Fe NW) under a magnetic field, was developed to produce Fe@PANI core-shell nanowires. The synthesized nanowires with various PANI additions (0-30 wt.%) were characterized and used as microwave absorbers. Epoxy composites with 10 wt.% absorbers were prepared and examined using the coaxial method to reveal their microwave absorbing performance. Experimental results showed that the Fe NWs with PANI additions (0-30 wt.%) had average diameters ranging from 124.72 to 309.73 nm. As PANI addition increases, the α-Fe phase content and the grain size decrease, while the specific surface area increases. The nanowire-added composites exhibited superior microwave absorption performance with wide effective absorption bandwidths. Among them, Fe@PANI-90/10 exhibits the best overall microwave absorption performance. With a thickness of 2.3 mm, effective absorption bandwidth was the widest and reached 3.73 GHz, ranging from 9.73 to 13.46 GHz. Whereas with a thickness of 5.4 mm, Fe@PANI-90/10 reached the best reflection loss of -31.87 dB at 4.53 GHz.
一锅法工艺将聚苯胺（即PANI）的聚合与随后在磁场下铁纳米线（即Fe NW）的还原相结合，用于制备Fe@PANI核壳纳米线。对添加不同量聚苯胺（0-30 wt.%）合成的纳米线进行了表征，并用作微波吸收剂。制备了含有10 wt.%吸收剂的环氧复合材料，并使用同轴法对其进行检测，以揭示其微波吸收性能。实验结果表明，添加聚苯胺（0-30 wt.%）的Fe NW平均直径在124.72至309.73 nm之间。随着聚苯胺添加量的增加，α-Fe相含量和晶粒尺寸减小，而比表面积增加。添加纳米线的复合材料表现出优异的微波吸收性能，有效吸收带宽较宽。其中，Fe@PANI-90/10表现出最佳的整体微波吸收性能。厚度为2.3 mm时，有效吸收带宽最宽，达到3.73 GHz，范围为9.73至13.46 GHz。而厚度为5.4 mm时，Fe@PANI-90/10在4.53 GHz时达到最佳反射损耗-31.87 dB。
