A facile fabrication and highly tunable microwave absorption of 3D flower-like Co3O4-rGO hybrid-architectures
A facile fabrication and highly tunable microwave absorption of 3D flower-like Co3O4-rGO hybrid-architectures
复制标题
3D 花状 Co3O4-rGO 混合结构的简易制造和高度可调的微波吸收
DOI：
10.1016/j.cej.2018.01.152
复制
发表时间：
2018-05-01
影响因子：
15.1
通讯作者：
Cao, Maosheng
中科院分区：
文献类型：
--
作者：
Ma, Junru;Wang, Xixi;Cao, Maosheng
电磁波吸收材料由于在军事、航空航天、通信和电子工业等领域的广泛应用而日益受到人们的关注。具有可调谐带宽和热稳定性的高效微波吸收是一个巨大的挑战。在此，我们通过一种简单、绿色和高度可调的策略制备了一种新型的3D分层Co 3 O 4-rGO混合结构。多孔Co_3O_4花组装均匀，引入大量的界面。裁剪Co 3 O 4花可以改善界面极化和偶极极化以及导电网络，高度调节杂化结构和电磁性能。当Co_3O_4/rGO比为2：1时，反射损耗（RL）达到-61dB，并具有频率选择性吸收。在353-473 K的高温下，RL相对稳定，带宽展宽，几乎覆盖了整个研究频率。这一结果归因于利用多界面磁性微花来调谐阻抗匹配，而阻抗匹配伴随着强烈的弛豫损耗和电损耗，以及磁损耗。我们的工作证实了三维分级结构Co 3 O 4-rGO杂化材料作为恶劣环境下高效微波吸收剂的潜在候选者，为未来微波吸收剂的设计提供了一条新的途径。
Electromagnetic absorption materials have drawn increasing attention owing to their wide applications in military, aerospace, communication and the electronic industry. Efficient microwave absorption with tunable bandwidth and thermal stability is a great challenge. Herein, we fabricate a novel 3D hierarchical Co3O4-rGO hybrid-architecture by a facile, green and highly tunable strategy. The porous Co3O4 flower is assembled uniformly, introducing great amount of interfaces. Tailoring Co3O4 flowers could improve interfacial polarization and dipole polarization as well as conductive network, highly tuning the hybrid-architectures and electromagnetic properties. The reflection loss (RL) reaches -61 dB at Co3O4/rGO ratio of 2: 1, as well as frequencyselective absorption. Furthermore, the RL are relatively stable and the bandwidth is broadened almost covering the whole investigated frequency at elevated temperature of 353-473 K. The result is ascribed to utilizing multi-interface magnetic micro-flowers to tune impedance matching, which is accompanied with strong relaxation loss and electrical loss, as well as magnetic loss. Our work confirms that 3D hierarchical Co3O4-rGO hybrids as a potential candidate for high-efficiency microwave absorbers in harsh environment, and provide a novel pathway for designing microwave absorber in the future.