Faculty of Printing, Packaging and Digital Media Technology, Xi'an University of Technology, Xi'an, Shaanxi710048, P. R. China.
China National Silicon Substrate LED Engineering Technology Research Center, Nanchang University, Nanchang330096, P. R. China.
ACS Appl Mater Interfaces. 2023 Jan 25;15(3):4580-4590. doi: 10.1021/acsami.2c20631. Epub 2023 Jan 11.
Newly emerged two-dimensional transition metal carbides and/or nitrides (MXenes) have attracted considerable interest in the field of electromagnetic wave absorption, but their excessive conductivity and single loss mechanism limit their applicability. Herein, an MXene decorated with SiC@Co/C was prepared by in situ growth and carbonization processes, followed by electrostatic self-assembly. The electromagnetic wave absorption performance of MXene@SiC@Co/C with a bird-nest-like structure could be effectively regulated and optimized by changing the proportion of MXene and SiC@Co/C. The prepared MXene@SiC@Co/C hybrid absorbers reveal superior impedance matching, complementary dissipation mechanism, and plentiful heterointerfaces. Profiting from the synergy of abovementioned factors, the resultant MXene@SiC@Co/C absorber exhibits an optimum reflection loss (RL) value of -76.5 dB at 6.36 GHz under a thickness of 3.9 mm and broad effective absorption bandwidth (EAB, RL ≤ -10 dB) of 6.2 GHz (11.8-18.0 GHz) with a thickness of only 2.0 mm, covering the entire Ku band. This work offers new insights into designing and fabricating highly efficient MXene-based electromagnetic absorbers.
新兴的二维过渡金属碳化物和/或氮化物 (MXenes) 在电磁波吸收领域引起了相当大的兴趣，但它们过高的电导率和单一的损耗机制限制了它们的适用性。在此，通过原位生长和碳化过程制备了一种 MXene 上修饰有 SiC@Co/C 的材料，并通过静电自组装进行进一步处理。通过改变 MXene 和 SiC@Co/C 的比例，可以有效地调节和优化具有鸟巢状结构的 MXene@SiC@Co/C 的电磁波吸收性能。所制备的 MXene@SiC@Co/C 杂化吸收剂具有优越的阻抗匹配、补充损耗机制和丰富的异质界面。得益于上述因素的协同作用，所得的 MXene@SiC@Co/C 吸收剂在厚度为 3.9mm 时，在 6.36GHz 下表现出-76.5dB 的最佳反射损耗 (RL) 值，在厚度仅为 2.0mm 时，在 6.2GHz（11.8-18.0GHz）范围内具有 6.2GHz（11.8-18.0GHz）的宽有效吸收带宽 (EAB，RL≤-10dB)。这项工作为设计和制造高效的基于 MXene 的电磁波吸收剂提供了新的思路。
