Center for Smart Materials and Devices, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China.
Key Laboratory of Tropical Crop Products Processing of Ministry of Agriculture and Rural Affairs, Agricultural Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Renmin Avenue 48, Zhanjiang 524001, China.
J Colloid Interface Sci. 2022 Mar;609:33-42. doi: 10.1016/j.jcis.2021.11.192. Epub 2021 Dec 2.
Three-dimensional (3D) porous molybdenum disulfide nanosheets/carbon nanofibers (MoS/CNF) hybrid aerogels were synthesized by using solvothermal method and following carbonization, where two-dimensional (2D) MoS nanosheets were homogenously in-situ grown on the interconnected CNF skeleton derived from bacterial cellulose, forming a hierarchical porous structure. This unique heterogeneous structure of the MoS/CNF hybrid aerogels were conducive to electromagnetic loss, including conduction, polarization, multi-scatterings, and reflections, thus resulting in a balanced impedance matching and microwave attenuation capacity. It was found that the resulted MoS/CNF hybrid aerogels demonstrate excellent microwave absorbing performance when the only 5.0 wt% fillers were loaded in paraffin. Particularly, MoS/CNF-2-900 hybrid aerogel displayed an effective absorption bandwidth of 5.68 GHz and minimum reflection loss (RL) value of -36.19 dB at a thickness of 2.0 mm. As the thickness increases to 4.4 mm, the RL value of MoS/CNF-2-900 hybrid aerogel reaches -48.53 dB. Electromagnetic loss mechanism analysis indicates that such improved microwave attenuation is attributed to proper component, multiple heterogenous interface and hierarchical porous structures. All the results in this work pave the avenue for the development of ultralight microwave absorber with high absorption capacity as well as broad effective absorption bandwidth.
三维（3D）多孔二硫化钼纳米片/碳纳米纤维（MoS/CNF）杂化气凝胶是通过溶剂热法和随后的碳化合成的，其中二维（2D）MoS 纳米片均匀地原位生长在来源于细菌纤维素的互连 CNF 骨架上，形成分级多孔结构。MoS/CNF 杂化气凝胶的这种独特的非均相结构有利于包括传导、极化、多次散射和反射在内的电磁损耗，从而实现平衡的阻抗匹配和微波衰减能力。结果表明，当仅负载 5.0wt%的填料在石蜡中时，所得的 MoS/CNF 杂化气凝胶表现出优异的微波吸收性能。特别是，MoS/CNF-2-900 杂化气凝胶在 2.0mm 的厚度下表现出 5.68GHz 的有效吸收带宽和-36.19dB 的最小反射损耗（RL）值。当厚度增加到 4.4mm 时，MoS/CNF-2-900 杂化气凝胶的 RL 值达到-48.53dB。电磁损耗机制分析表明，这种微波衰减的改善归因于适当的成分、多种异质界面和分级多孔结构。这项工作的所有结果为开发具有高吸收容量和宽有效吸收带宽的超轻量微波吸收体铺平了道路。
