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Lei Liu team today Chem. Eng. J. : MXene/ Cellulose Microfiber composite graphene, Microwave absorption

2022-04-21

First author: Jianqiao Wang


Corresponding author: Liu Lei


Corresponding unit: Southeast University


DOI: 10.1016 / j.carol carroll ej. 2022.135734


The full text quick reference


It is a promising strategy to solve the electromagnetic pollution problem by introducing new nanomaterials to develop various electromagnetic wave absorbers. In recent years, MXene has become a shining star that cannot be ignored in various fields due to its unique carbide nuclear structure and abundant surface functional groups that give it satisfactory hydrophilic and adjustable electrical properties. Although Ti3C2Tx MXene is recognized as a highly efficient microwave absorption candidate, there is still a contradiction between maintaining impedance matching and improving dielectric loss.



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Figure 1. Schematic diagram of MCGA preparation process.


In this paper, to overcome these challenges, the authors successfully designed a unique 1D/2D interpenetrating network structure consisting of one-dimensional MXene/ cellulose (MC) composite microfibers and a graphene porous framework.


Article point 2: Firstly, Ti3C2Tx MXene was loaded on the flexible carboxymethyl cellulose microfiber, and a one-dimensional core-shell structure was formed by self-assembly. Subsequently, MC/ graphene aerogel (MCGA) was prepared by hydrothermal reduction and cross-linking of reduced GO layers. It was found that the complex cross-linking network and rich bonding interface in aerogel can promote the conductive loss and polarization loss, while MC microfiber can effectively improve the overall impedance matching degree by improving the inner pore structure.


Test results show that MCGA has an optimal reflection loss of -87.48 dB and a maximum effective absorption bandwidth (EAB) of 10.4 GHz, superior to almost all previously reported Mxene-based microwave absorbers. In addition, MCGA also exhibits multi-functional properties such as hydrophobicity, heat insulation and compressibility, thus revealing the effectiveness and advantages of this design approach.


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Figure 2. Morphology and microstructure characterization of MCGA.


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Figure 3. Spectral characterization of the prepared materials.


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Figure 4. Microwave absorption properties of MCGA.


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Figure 5. Comparison of aerogels prepared by different construction strategies.


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Figure 6. Schematic diagram of microwave absorption mechanism of MCGA.


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Figure 7. Multi-functional properties of MCGA.




reference


Jianqiao Wang, Ze Wu, Youqiang Xing, Lei Liu.A novel 1D/2D interpenetrating network architecture of MXene/cellulose composite microfiber and graphene for Broadband microwave absorption. Chem. Eng. J. 2022. DOI: 10.1016 / j.carol carroll ej. 2022.135734.


https://doi.org/10.1016/j.cej.2022.135734


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