Toward high performance microwave absorber by implanting La0.8CoO3 nanoparticles on rGO
Toward high performance microwave absorber by implanting La0.8CoO3 nanoparticles on rGO
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DOI：
10.1016/j.jmst.2023.06.062
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
L. Chang;Yu‐Ze Wang;Xin-Ci Zhang;Lin Li;Hua-Zhang Zhai;M. Cao
中科院分区：
文献类型：
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作者：
L. Chang;Yu‐Ze Wang;Xin-Ci Zhang;Lin Li;Hua-Zhang Zhai;M. Cao
“智能时代”的到来给我们的生活带来了更多的便利，但我们周围的电磁辐射不仅极大地威胁着人类的健康，也给国防安全带来了信息泄露和隐患。因此，开发轻质、强吸收、吸收频率可调、宽带吸收的新型电磁波吸收材料迫在眉睫。本文通过构建La0.8CoO3- rgo纳米复合材料，利用氧化石墨烯与La0.8CoO3之间的静电相互作用，将La0.8CoO3纳米粒子固定在石墨烯纳米片上，获得了一种新型的电磁波吸收剂。研究了la0.8 coo3与氧化石墨烯杂化比对微波吸收性能的影响。La0.8CoO3-rGO纳米复合材料的最佳反射损耗可达-62.34 dB，最大有效带宽为6.08 GHz，分别比裸la0.8 coo3纳米材料增加48.78%和245.45%。通过将吸收层厚度从2.4 mm裁剪到4.4 mm，有效吸收带宽覆盖了从Ku波段到C波段的较宽电磁波吸收带。la0.8 coo3和rGO的协同作用，将共振、电导、弛豫和散射损耗等引起的磁损耗和介电损耗集成在一起，使其具有迷人的电磁波吸收性能。这一结果证实了La0.8CoO3-rGO纳米复合材料是高效微波吸收材料的潜在候选材料，为未来设计高性能微波衰减材料提供了有价值的途径。
The advent of “intelligent era” brings our life more convenience, but the electromagnetic radiation surrounding us not only greatly threatens human health, also makes information leakage and hidden trouble to national defense security. Hence, it is very urgent to develop novel electromagnetic wave absorption materials with lightweight, strong absorption, tunable absorption frequency and broad band absorption. Herein, a novel electromagnetic wave absorber is obtained by constructing La0.8CoO3-rGO nanocomposite, where La0.8CoO3nanoparticles are anchored on graphene nanosheets by the electrostatic interaction between GO and La0.8CoO3. The effect of hybridization ratio of La0.8CoO3and rGO on microwave absorption properties is carefully studied. The optimal reflection loss of La0.8CoO3-rGO nanocomposite can reach -62.34 dB with the maximum effective bandwidth of 6.08 GHz, presenting 48.78% and 245.45% increment compared to bare La0.8CoO3nanoparticles, respectively. The effective absorption bandwidth covers a broad electromagnetic wave absorption band from Ku band to the C band by tailoring thickness of the absorbers from 2.4 mm to 4.4 mm. The fascinating electromagnetic wave absorption performance is attributed to the synergy effect of La0.8CoO3and rGO, which integrates magnetic and dielectric loss caused by resonance, conductance, relaxation, and scattering loss. This result confirms that La0.8CoO3-rGO nanocomposite is potential candidates toward high-efficiency microwave absorbers and provides a valuable pathway for designing high-performance microwave attenuation materials in the future.