Li Ningning, Shu Ruiwen, Zhang Jiabin, Wu Yue
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, People's Republic of China; School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, People's Republic of China.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, People's Republic of China; School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, People's Republic of China; Institute of Environment-friendly Materials and Occupational Health of Anhui University of Science and Technology (Wuhu), Wuhu 241003, People's Republic of China; Anhui International Joint Research Center for Nano Carbon-based Materials and Environmental Health, Anhui University of Science and Technology, Huainan 232001, People's Republic of China.
J Colloid Interface Sci. 2021 Aug 15;596:364-375. doi: 10.1016/j.jcis.2021.03.143. Epub 2021 Mar 29.
Developing light-weight, thin thickness and high-efficiency electromagnetic wave (EMW) absorbers was regarded as an effective strategy for dealing with the increasingly serious problem of electromagnetic radiation pollution. Herein, nitrogen-doped reduced graphene oxide/multi-walled carbon nanotubes/zinc ferrite (NRGO/MWCNTs/ZnFeO) composite aerogel was synthesized via solvothermal followed by hydrothermal and lyophilization processes. Morphological characterization results manifested that the attained ternary composite aerogel displayed unique three-dimensional porous netlike structure, which was composed of partial stack of adjacent NRGO sheets entangled by MWCNTs and decorated with ZnFeO microspheres. Moreover, the influences of complexing with conductive MWCNTs and magnetic ZnFeO, and filler contents on the EMW attenuation performance of ternary composite aerogel were examined. Significantly, the ternary composite aerogel exhibited notably strengthened EMW absorption capacity in comparison with NRGO/MWCNTs composite aerogel, NRGO aerogel and ZnFeO microspheres. The minimum reflection loss (RL) was up to -52.6 dB at a thin matching thickness of 1.7 mm and effective absorption bandwidth (EAB) was 5.1 GHz (12.7-17.8 GHz) under an ultrathin thickness of 1.65 mm with a low filler content of 10 wt%. Remarkably, the |SRL| (|specific RL value per thickness|) could achieve 30.9 dB/mm, which overwhelmed almost all the reported RGO-based composite aerogels. Besides, the possible EMW absorption mechanisms of as-synthesized ternary composite aerogel were proposed. It was believed that our results provided a valuable guidance for fabricating graphene-based composites with three-dimensional netlike structure as light-weight, thin thickness and high-performance EMW absorbers.
开发轻质、薄厚度和高效的电磁波（EMW）吸收剂被视为应对日益严重的电磁辐射污染问题的有效策略。在此，通过溶剂热法，随后进行水热法和冻干法合成了氮掺杂还原氧化石墨烯/多壁碳纳米管/铁酸锌（NRGO/MWCNTs/ZnFeO）复合气凝胶。形态表征结果表明，所得的三元复合气凝胶呈现出独特的三维多孔网状结构，该结构由相邻NRGO片的部分堆叠组成，这些片被MWCNTs缠绕并装饰有ZnFeO微球。此外，研究了与导电MWCNTs和磁性ZnFeO复合以及填料含量对三元复合气凝胶EMW衰减性能的影响。值得注意的是，与NRGO/MWCNTs复合气凝胶、NRGO气凝胶和ZnFeO微球相比，三元复合气凝胶表现出显著增强的EMW吸收能力。在1.7 mm的薄匹配厚度下，最小反射损耗（RL）高达-52.6 dB，在1.65 mm的超薄厚度和10 wt%的低填料含量下，有效吸收带宽（EAB）为5.1 GHz（12.7 - 17.8 GHz）。值得注意的是，|SRL|（|每厚度的比RL值|）可达30.9 dB/mm，几乎超过了所有报道的基于RGO的复合气凝胶。此外，还提出了合成的三元复合气凝胶可能的EMW吸收机制。相信我们的结果为制备具有三维网状结构的石墨烯基复合材料作为轻质、薄厚度和高性能EMW吸收剂提供了有价值的指导。
