NiFe LDH/MXene Derivatives Interconnected with Carbon Fabric for Flexible Electromagnetic Wave Absorption

Abstract

Cross-linking network structures are critical to construct flexible and lightweight electromagnetic (EM) wave absorbers, for which effective regulation of the EM parameters is essential. Herein, a versatile strategy has been developed by interconnecting carbon fibers with NiFe-layered double hydroxide (NiFe LDH)/MXene derivatives. The large-sized flaky morphology and conductive nature of the interconnectors induce the percolation effect in the fabric networks with ultralow addition. As such, efficient adjustment of the EM parameters can be achieved by tuning the content of the interconnectors around the percolation threshold, giving rise to an optimal reflection loss (RL) of −58.0 dB and a wide effective absorption band (EAB) of 7.0 GHz at a thickness of 2.5 mm under the incorporation of 7.0 wt % NiFe LDH/MXene. This work provides insights on constructing percolation networks and effective manipulation of electronic and magnetic properties, which can be extended to various areas such as sensing, catalysis, and energy storage.

Carbonized Silk Fiber Mat: a Flexible and Broadband Microwave Absorber, and the Length Effect

“…In our prepared carbonized silk fiber mat/silicon material, the carbonized fiber acts as the only dissipation material to provide dielectric attenuation in the composite. With higher fiber length and continuity, more connection between adjacent fibers would be created, which enhances the free migration of electrons and further improves the conductive loss of the composites. , As a result, the change in permittivity affects the performance of the short fiber composites significantly. Figure d–f provides the calculated RL maps of the three samples loaded with short fibers.…”

3D Ultralight Hollow NiCo Compound@MXene Composites for Tunable and High-Efficient Microwave Absorption

“…Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and MXene/Co nanochains [12] NiFe LDH/MXene [27] NiAi-LDH/Graphene [4] CF@MXene@MoS 2 [43] CMT@CNT/Co [56] Ni@Mxene [2] This indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material.…”

“…The existence of polarization loss, electrical loss and open void space contributed to substantially strong RL min of − 45.7 dB and broaden EAB of 9.0 GHz at 3.7 mm (20 wt%). Wang et al [ 27 ] constructed carbon fabric interconnected with NiFe LDH/MXene-derived FeNi 3 /TiO 2 absorber, and adjust the content of FeNi 3 /TiO 2 surrounding the percolation threshold to achieve superior absorption performance. Under the addition of 7.0 wt% NiFe LDH/MXene precursor, FeNi 3 /TiO 2 displayed an optimal RL min of − 58.0 dB and a broad EAB of 7.0 GHz at 2.5 mm.…”

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

“…On the one hand, the incident EMW that can enter the material is reflected and scattered, with large amount of EMW attenuating in the process [70]. Secondly, due to the different layered media between NiCo alloy and rod-like ZnO, electrons will accumulate on the contact interface, leading to interface polarization, which is an important reason for the excellent dielectric parameters of S-5 [71,72]. Thirdly, the presence of NiCo@C composites and O vacancies cause dipole polarization in face of an external magnetic field, which promotes the loss of incident EMW.…”