Chen Yi, Liu Xiaoyun, Mao Xiaoyang, Zhuang Qixin, Xie Zhong, Han Zhewen
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Nanoscale. 2014 Jun 21;6(12):6440-7. doi: 10.1039/c4nr00353e.
Ferromagnetic γ-Fe2O3 nanoparticles were successfully loaded into multi-walled carbon nanotubes (MWNTs) as probed by transmission electron microscopy. Upon incorporation of the γ-Fe2O3-MWNTs into poly(p-phenylenebenzobisoxazole) (PBO), a conjugated polymer with high mechanical strength and outstanding thermal and oxidative stability, microwave absorbing materials were obtained. Attributed to the special structure of the γ-Fe2O3-MWNTs, synergistic effects on dielectric loss and magnetic loss, and a better matched characteristic impedance of the composites were achieved. The optimal minimum reflection loss reached -32.7 dB at 12.09 GHz on a composite containing 12 wt% γ-Fe2O3-MWNTs with a thickness of 2.7 mm, and the corresponding bandwidth below -5 dB was 6.2 GHz. This demonstrated its potential applications as a low-density microwave absorbing material operating under extreme environments.
通过透射电子显微镜探测发现，铁磁性γ-Fe2O3纳米颗粒已成功负载到多壁碳纳米管（MWNTs）中。将γ-Fe2O3-MWNTs掺入聚对苯撑苯并双恶唑（PBO）（一种具有高机械强度以及出色热稳定性和氧化稳定性的共轭聚合物）后，获得了微波吸收材料。由于γ-Fe2O3-MWNTs的特殊结构，复合材料实现了介电损耗和磁损耗的协同效应以及更好匹配的特性阻抗。在厚度为2.7 mm、含有12 wt%γ-Fe2O3-MWNTs的复合材料上，最佳最小反射损耗在12.09 GHz时达到-32.7 dB，相应的低于-5 dB的带宽为6.2 GHz。这证明了其作为在极端环境下运行的低密度微波吸收材料的潜在应用。
