High-Density Anisotropy Magnetism Enhanced Microwave Absorption Performance in Ti₃C₂T_x MXene@Ni Microspheres

Abstract

Two-dimensional materials, especially the newly emerging MXene, have attracted numerous interests in the fields of energy conversion/storage and electromagnetic shielding/absorption. However, the inherently inevitable aggregation and absence of magnetic loss of MXene considerably limit its electromagnetic absorption application. The introduction of magnetic component and favorable structural engineering are the alternatives to improve the microwave absorption (MA) performance. Herein, we report a spheroidization strategy to assemble double-shell MXene@Ni microspheres, where the commonly lamellar MXene are reshaped into three-dimensional microspheres that provide the substrate for oriented growth of Ni nanospikes. Whereas this structural feature offers massive accessible active surfaces that effectively promote the dielectric loss ability, the introduction of magnetic Ni nanospikes enables the additional magnetic loss capacity. Benefiting from these merits, the synthesized 3D MXene@Ni microspheres exhibit superior MA performance with the minimum reflection loss value of −59.6 dB at an ultrathin thickness (∼1.5 mm) and effective absorption bandwidth of 4.48 GHz. Moreover, the electron holography results reveal that the high-density anisotropy magnetism plays an important role in the improvement of MA performance, which provides an insight for the design of MXene-based materials as high-efficient microwave absorbers.

Magnetic Interacted Interaction Effect in MXene Skeleton: Enhanced Thermal‐Generation for Electromagnetic Interference Shielding

“…[ 11 ] From the high‐resolution C 1s spectra, three peaks corresponding to CTi (282.0 eV), CC (284.6 eV), and CO (286.5 eV) are observed (Figure S1e, Supporting Information). [ 12 ] In addition, the characteristic peaks for the O 1s spectra appear at 529.8, 532.9, and 534.9 eV, which can be indexed to TiO, OAl and adsorbed water, respectively (Figure S1f, Supporting Information). [ 12 ]…”

“…[11] From the highresolution C 1s spectra, three peaks corresponding to CTi (282.0 eV), CC (284.6 eV), and CO (286.5 eV) are observed (Figure S1e, Supporting Information). [12] In addition, the characteristic peaks for the O 1s spectra appear at 529.8, 532.9, and 534.9 eV, which can be indexed to TiO, OAl and adsorbed water, respectively (Figure S1f, Supporting Information). [12] Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were conducted to reveal the internal morphological features of the Ti zoomed-in cross-sectional images, the hybrid films are observed to all maintain a well-aligned lamellar structure (Figure 1).…”

“…[12] In addition, the characteristic peaks for the O 1s spectra appear at 529.8, 532.9, and 534.9 eV, which can be indexed to TiO, OAl and adsorbed water, respectively (Figure S1f, Supporting Information). [12] Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were conducted to reveal the internal morphological features of the Ti zoomed-in cross-sectional images, the hybrid films are observed to all maintain a well-aligned lamellar structure (Figure 1). For MCF-1 samples, 1D MWCNTs are evenly interspersed in the MXene layers with a thickness of approximately 20 µm (Figure 1a,d).…”

Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

“…6 c. Firstly, the 3D porous framework of Ni/MXene-MF could form an interconnected conductive network, which could effectively help the migration of electrons, resulting in conduction losses and attenuating microwave energy [ 53 – 55 ]. Second, the Ni/MXene hybrid with a capacitor-like structure could provide a large number of interfaces, which could cause charge accumulation in the constantly changing EM field, generating interface polarization effects [ 56 , 57 ]. In addition, abundant terminating functional groups and inherent defects of layered MXene will cause dipole polarization and defect polarization under high-frequency EM fields.…”

The Effect of Surface Roughness of Magnetic Particles on the Electromagnetic Wave Absorbing Performance of Fe3O4/Multiwalled Carbon Nanotubes Hybrids

“…Based on the loss mechanism, the absorbing materials can be divided into resistance loss, dielectric loss and magnetic loss. Usually, dielectric loss materials include carbon nanotubes, [1] graphene, [2,3] Mxenes, [4,5] etc. Magnetic loss materials include ferrite, [6] ferrocobalt alloy, [7] cobalt-nickel oxide etc.…”