Three-Dimensional Hierarchical Architecture of the TiO₂/Ti₃C₂T_x/RGO Ternary Composite Aerogel for Enhanced Electromagnetic Wave Absorption

Abstract

Tunable and high-efficiency electromagnetic wave (EMW) absorption materials composed of a threedimensional (3D) hierarchical reduced graphene oxide (RGO) aerogel network entrapped with TiO 2 /Ti 3 C 2 T x hybrids were fabricated by a hydrothermal method and a mild chemical reduction treatment. The incorporation of the TiO 2 /Ti 3 C 2 T x micronanoheterostructure and construction of the 3D welldesigned hierarchical interconnected network can significantly reduce the agglomeration of RGO sheets together with the beneficial effect of a better impedance match. When the filler loading is 10 wt %, the maximum reflection loss of the composite aerogel reaches up to −65.3 dB with a matching thickness of 2.5 mm. Meanwhile, the effective absorption bandwidth (RL < −10 dB) is 4.3 GHz with the coating thickness of only 2.0 mm, and the tunable absorption bandwidth achieves at 13.74 GHz via modulating the absorber thicknesses in a range from 1.5 to 5.0 mm. The enhanced EMW absorbing performance is closely related to highly porous conductive networks, better impedance match, multiple reflection, and scattering and defective polarization properties. Consequently, these results indicate a promising route to fabricate a lightweight, thin thickness, highly efficient, and broadband EMW absorber, which can facilite the control and purification of the EM environment and realize the sustainable utilization of EMW.

Hierarchical Carbon Fiber@MXene@MoS2 Core‐sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

“…The peaks of Ti 3 C 2 T x at 414 and 616 cm −1 correspond to nonstoichiometric TiC vibrations. [ 45 ] Another relatively weak peak around 150 cm −1 can be assigned to TiO vibration from oxygen‐containing function groups on the surface, [ 46 ] which is slightly enhanced in CMM due to the small amount of TiO 2 . These results demonstrate that Ti 3 C 2 T x flakes are compounded to CF without changing the lattice structure and the surface of CM is completely covered by a thick sheath of MoS 2 layers.…”

MXene-based 3D porous macrostructures for electrochemical energy storage

“…Some works report the formation of hybrid graphene/MXene composites [59][60][61][62][63]. GO can help to stabilize the MXene flakes in the suspension forming a composite sol or gel, making it possible to freeze-dry it.…”

Enhanced Microwave Absorption and Electromagnetic Properties of Si-Modified rGO@Fe3O4/PVDF-co-HFP Composites

“…Meanwhile, the spherical Fe3O4 NPs on the Si-modified rGO sheets are featured with rough surface and non-uniform diameters (Figure a,b,d,e). As demonstrated in Figure S1 (Supplementary Materials), the composite Si-modified rGO@Fe3O4 still possesses abundant wrinkles as same as that of rGO@Fe3O4 composite, which will benefit for improving the multiplereflection of EMW [37][38][39]. Furthermore, the SEM images of the Si-modified rGO@Fe3O4/PVDF-co-HFP films illustrate that the Si-modified rGO@Fe3O4 are well dispersive in PVDF-co-HFP (Figure 1c The analysis of FT-IR and XRD is first devoted to investigating the composition of the Simodified rGO@Fe3O4 nanocomposites.…”