Heterodimensional Structure Switching Multispectral Stealth and Multimedia Interaction Devices

Abstract

Lightweight and flexible electronic materials with high energy attenuation hold an unassailable position in electromagnetic stealth and intelligent devices. Among them, emerging heterodimensional structure draws intensive attention in the frontiers of materials, chemistry, and electronics, owing to the unique electronic, magnetic, thermal, and optical properties. Herein, an intrinsic heterodimensional structure consisting of alternating assembly of 0D magnetic clusters and 2D conductive layers is developed, and its macroscopic electromagnetic properties are flexibly designed by customizing the number of oxidative molecular layer deposition (oMLD) cycles. This unique heterodimensional structure features highly ordered spatial distribution, with an achievement of electron‐dipole and magnetic–dielectric double synergies, which exhibits the high attenuation of electromagnetic energy (160) and substantial improvement of dielectric loss tangent (≈200%). It can respond to electromagnetic waves of different bands to achieve multispectral stealth, covering visible light, infrared radiation, and gigahertz wave. Importantly, two kinds of ingenious information interaction devices are constructed with heterodimensional structure. The hierarchical antennas allow precise targeting of operating bands (S‐ to Ku‐ bands) by oMLD cycles. The strain imaging device with high sensitivity opens a new horizon for visual interaction. This work provides a creative insight for developing advanced micro–nano materials and intelligent devices.

Microstructure optimization strategy of ZnIn2S4/rGO composites toward enhanced and tunable electromagnetic wave absorption properties

“…With the increasing frequency, the ε ′ values of all these ZnIn 2 S 4 /rGO composites decrease, exhibiting the typical electrical dispersion effect, which may be because the motion of the dipole lags behind the periodic variation of the electromagnetic field. 32–34 It can be seen from multiple small fluctuations in the ε ″ curves of these ZnIn 2 S 4 /rGO composites, revealing multiple relaxations due to interfacial and dipole polarization. The interfacial polarization originates from the accumulation of free charges and rearrangement at the interfaces of ZnIn 2 S 4 –rGO, rGO–rGO, and ZnIn 2 S 4 –ZnIn 2 S 4 under an alternating electromagnetic field.…”

Heterojunction MoS2@VO2 Microspheres for Electromagnetic Wave Absorption in the X-Band

“…In the TEM images of the three sets of samples, the outer thin gauzelike shell is MoS 2 , which can be observed to grow uniformly on the surface of the spheres in VM-1, and there are also clusters of MoS 2 around the spheres. The same is true for VM-2 and VM-3, but in VM-2, MoS 2 also has raised portions on the sphere surface during growth, which leads to more inhomogeneous structures and causes more inconsistent electron motion velocities when the external electromagnetic field changes, 41 which in turn causes polarization behavior. TEM-EDS characterization of VM-2 reveals that the spheres are interconnected, and the hollow VO 2 spheres can be seen through the elemental distribution state, which, combined with the images of VO 2 in the support material, can determine that the spheres are hollow structures and that the material is excellent and well bonded.…”

Corncob-Derived Two-Dimensional N-Doped Carbon Sheets as the Ultrabroadband Microwave-Absorbing Material

“…24,25 In terms of structural regulation, two-dimensional materials and their heterodimensional structures have been proven to have wide application prospects in electromagnetic protection. 26,27 However, existing structural regulation for biomass-derived carbon mainly focuses on onedimensional tubular/fibrous structures and three-dimensional porous structures. 28−31 In addition, there is extensive research on activation through activators such as CO 2 and KOH to increase the specific surface area and enrich the pore structure.…”

“…The composition modulation generally involves the introduction of magnetic metal powders into carbon materials aimed at improving the magnetic loss capability. , However, due to the poor stability of magnetic metal powders under extreme conditions, their practical applications may be limited. The introduction of more stable heteroatoms, such as nitrogen, in carbon materials may help improve the dielectric properties and thus enhance the polarization loss, eventually solving the aforementioned problem. , In terms of structural regulation, two-dimensional materials and their heterodimensional structures have been proven to have wide application prospects in electromagnetic protection. , However, existing structural regulation for biomass-derived carbon mainly focuses on one-dimensional tubular/fibrous structures and three-dimensional porous structures. − In addition, there is extensive research on activation through activators such as CO 2 and KOH to increase the specific surface area and enrich the pore structure. Up to now, very few studies have investigated graphene-like, two-dimensional biomass-derived carbon as microwave-absorbing materials.…”