Boosting Interfacial Polarization Through Heterointerface Engineering in MXene/Graphene Intercalated-Based Microspheres for Electromagnetic Wave Absorption

Abstract

Multi-layer 2D material assemblies provide a great number of interfaces beneficial for electromagnetic wave absorption. However, avoiding agglomeration and achieving layer-by-layer ordered intercalation remain challenging. Here, 3D reduced graphene oxide (rGO)/MXene/TiO2/Fe2C lightweight porous microspheres with periodical intercalated structures and pronounced interfacial effects were constructed by spray-freeze-drying and microwave irradiation based on the Maxwell–Wagner effect. Such approach reinforced interfacial effects via defects introduction, porous skeleton, multi-layer assembly and multi-component system, leading to synergistic loss mechanisms. The abundant 2D/2D/0D/0D intercalated heterojunctions in the microspheres provide a high density of polarization charges while generating abundant polarization sites, resulting in boosted interfacial polarization, which is verified by CST Microwave Studio simulations. By precisely tuning the 2D nanosheets intercalation in the heterostructures, both the polarization loss and impedance matching improve significantly. At a low filler loading of 5 wt%, the polarization loss rate exceeds 70%, and a minimum reflection loss (RLmin) of −67.4 dB can be achieved. Moreover, radar cross-section simulations further confirm the attenuation ability of the optimized porous microspheres. These results not only provide novel insights into understanding and enhancing interfacial effects, but also constitute an attractive platform for implementing heterointerface engineering based on customized 2D hierarchical architectures.

Reduced Graphene Oxide/MXene/FeCoC Nanocomposite Aerogels Derived from Metal–Organic Frameworks toward Efficient Microwave Absorption

“…This indicates that the rGO/MXene/FeCoC nanocomposite is successfully prepared. In the C 1s spectrum, there are four peaks located at 281 eV, 284 eV, 286.0 eV, and 288.2 eV, which correspond to C–Ti, C–C, C–O, and C=O, respectively. , The XPS spectrum of Ti presents the fitted peaks at 457.28, 458.50, 460, and 464 eV assigned to Ti–C, Ti 2p 3/2 , Ti 2p 1/2 , and Ti–O, respectively . In addition, the peaks attributed to Ti–O (528.8 eV), C–OH (530.5 eV), C=O (532.1 eV), and C–OH= (533.4 eV) can be found in the O 1s spectrum.…”

Nanorod-Derived Conductive Carbon Networks and Titanates-Involved Multicomponent Interfaces for Broadband Microwave Absorption

“…While for S-800 (Figure d), two incomplete semicircles, a distorted semicircle, and a straight tail can be viewed, revealing only three types of polarization processes. Rich interfaces between Fe 2 TiO 4 , FeTiO 3 , and C may lead to space charge accumulation and act as distinct polarization centers . Meanwhile, defects (including oxygen vacancies as revealed by XPS analysis) either in titanates or carbon would also promote dipole polarization.…”

Entropy engineering enhances the electromagnetic wave absorption of high-entropy transition metal dichalcogenides/N-doped carbon nanofiber composites

“…Therefore, developing efficient EMW absorption materials has become one of the hotspots in current research. 1–3…”