School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China.
Department of Joint Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an 710054, China.
J Colloid Interface Sci. 2023 Oct 15;648:983-993. doi: 10.1016/j.jcis.2023.06.061. Epub 2023 Jun 10.
MXene has great application potential in electromagnetic (EM) wave absorbers because of its high attenuation ability; however, self-stacking and excessively high conductivity are major obstacles to its widespread use. To address these issues, a NiFe layered double hydroxide (LDH)/ MXene composite with two-dimensional (2D)/2D sandwich-like heterostructure was constructed through electrostatic self-assembly. The NiFe-LDH not only acts as an intercalator to prevent self-stacking of the MXene nanosheets, but also serves as a low-dielectric choke valve to optimize impedance matching. At a thickness of 2 mm and filler loading of 20 wt%, the minimum reflection loss (RL) value could reach -58.2 dB, and the absorption mechanism was analyzed based on multiple reflection, dipole/interfacial polarization, impedance matching, and synergy between dielectric and magnetic losses. Furthermore, the simulation of the radar cross section (RCS) further confirmed the efficient absorption properties and application prospects of the present material. Our work demonstrates that designing sandwich structures based on 2D MXene is an effective way to improve the performance of EM wave absorbers.
MXene 因其高衰减能力在电磁（EM）波吸收体中有巨大的应用潜力；然而，自堆叠和过高的电导率是其广泛应用的主要障碍。为了解决这些问题，通过静电自组装构建了具有二维（2D）/2D 夹层异质结构的 NiFe 层状双氢氧化物（LDH）/MXene 复合材料。NiFe-LDH 不仅可以作为夹层剂来防止 MXene 纳米片的自堆叠，还可以作为低介电常数的扼流阀来优化阻抗匹配。在厚度为 2mm 和填充量为 20wt%的情况下，最小反射损耗（RL）值可达-58.2dB，并且基于多次反射、偶极子/界面极化、阻抗匹配以及介电损耗和磁损耗的协同作用对吸收机制进行了分析。此外，对雷达散射截面（RCS）的模拟进一步证实了本材料的高效吸收特性和应用前景。我们的工作表明，基于 2D MXene 设计夹层结构是提高 EM 波吸收体性能的有效方法。
