MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Science, Northwestern Polytechnical University, Xi'an 710072, PR China.
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Science, Northwestern Polytechnical University, Xi'an 710072, PR China.
J Colloid Interface Sci. 2018 Nov 15;530:212-222. doi: 10.1016/j.jcis.2018.06.088. Epub 2018 Jun 28.
α-FeO@SiO nanoparticles have been successfully enveloped in graphene nanosheets/thorns-like polyaniline matrix (RGO/thorns-like PANI/α-FeO@SiO nanocomposites) by some facile strategies. The measured electromagnetic parameters indicate that the interfacial polarization, the charge transfer, the multiple reflections and scatterings, the Debye dipolar relaxation processes, the magnetic loss, the quarter-wavelength matching and the well-matched characteristic impedance all play significant roles in improving the electromagnetic wave absorption performance. The maximum reflection loss of RGO/thorns-like PANI/α-FeO@SiO nanocomposites reaches -50.06 dB at 14.4 GHz with a matching thickness of only 2.3 mm, and the absorption bandwidth with reflection loss less than -10 dB is in the 4.0-18.0 GHz range for the absorber thickness of 1.5-5.5 mm. Moreover, the adding quantity of nanocomposites in the paraffin matrix is only 16.7 wt%. Consequently, it is believed that the nanocomposites could be used as an excellent electromagnetic wave absorber with lightweight, thin thickness, broad bandwidth and strong absorption.
α-FeO@SiO 纳米颗粒已成功地通过一些简便的策略包裹在石墨烯纳米片/刺状聚苯胺基质中（RGO/刺状 PANI/α-FeO@SiO 纳米复合材料）。测量的电磁参数表明，界面极化、电荷转移、多次反射和散射、德拜偶极弛豫过程、磁损耗、四分之一波长匹配和良好匹配的特征阻抗都在提高电磁波吸收性能方面发挥了重要作用。RGO/刺状 PANI/α-FeO@SiO 纳米复合材料的最大反射损耗在 14.4GHz 时达到-50.06dB，匹配厚度仅为 2.3mm，吸收带宽为反射损耗小于-10dB 的范围在 4.0-18.0GHz 之间，吸收体厚度为 1.5-5.5mm。此外，在石蜡基质中添加的纳米复合材料的量仅为 16.7wt%。因此，相信该纳米复合材料可用作具有轻重量、薄厚度、宽频带和强吸收性的优异电磁波吸收剂。
