Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modern Textile, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China.
Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modern Textile, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, PR China.
J Colloid Interface Sci. 2019 Feb 15;536:548-555. doi: 10.1016/j.jcis.2018.10.084. Epub 2018 Oct 26.
In this research, a facile in-situ growth method was applied to load ZnFeO nanoparticles on carbonyl iron (Fe) flakes. These loaded ZnFeO exhibited cone shape with an average size of ∼200 nm. The results revealed that the frequency region with reflection loss <-10 dB (f) was up to 6.2 GHz (d = 1.5 mm), suggesting excellent wideband electromagnetic absorption (EM) properties. The electromagnetic absorption mechanism was discussed in depth which attributed to the synergetic effect of Fe and ZnFeO. The loaded ZnFeO played a key role on suppressing inverse electromagnetic radiation, eddy effect, simultaneous maintaining moderate magnetic loss ability. Besides, the formed interface of ZnFeO/Fe could induce interface polarization relaxation effect at external electromagnetic field, which greatly boosted the effective dielectric loss ability (ε''). Meanwhile, the interface polarization intensity was controllable by tuning the weight ratio of Fe.
在这项研究中，采用了一种简便的原位生长方法将 ZnFeO 纳米粒子负载在羰基铁 (Fe) 薄片上。负载的 ZnFeO 呈锥形，平均尺寸约为 200nm。结果表明，反射损耗<-10dB(f)的频率范围高达 6.2GHz(d=1.5mm)，具有优异的宽带电磁吸收(EM)性能。深入讨论了电磁吸收机制，这归因于 Fe 和 ZnFeO 的协同效应。负载的 ZnFeO 在抑制反向电磁辐射、涡流效应以及同时保持适度的磁损耗能力方面发挥了关键作用。此外，ZnFeO/Fe 形成的界面在外磁场下可以诱导界面极化弛豫效应，极大地提高了有效介电损耗能力(ε'')。同时，可以通过调节 Fe 的重量比来控制界面极化强度。
