Confinedly growing and tailoring of Co₃O₄ clusters-WS₂ nanosheets for highly efficient microwave absorption

Abstract

Electromagnetic (EM) wave absorbing materials have been a research hotspot in materials science and related technical fields in recent years. Finding lightweight, efficient, and broadband electromagnetic wave absorbing materials has always been a very challenging subject. Herein, we successfully prepared Co3O4-WS2 hybrid nanosheets with heterostructures, which excellent combine the advantages of magnetic property of Co3O4 and dielectric property of WS2. By the electromagnetic synergy effect, maximum RL is up to −61.1 dB at 1.9 mm, and the bandwidth exceeds 5 GHz. Such highly efficient microwave absorption is attributed to not only the electromagnetic synergy effect, but the dipole polarization as well as conduction loss. These results show that the obtained Co3O4-WS2 is an excellent EM wave absorbing material and can be used as a candidate for advanced EM wave absorbing materials in the fields such as commerce, military and aerospace in future.

Novel MOF-derived 3D hierarchical needlelike array architecture with excellent EMI shielding, thermal insulation and supercapacitor performance

“…The peaks appearing around 194, 482, 522, 618, and 691 cm −1 are attributed to Co 3 O 4 . 37–39 The XPS spectra further confirm the successful preparation of Co 3 O 4 /C (Fig. 4b).…”

Extremely Reduced Dielectric Constant and Band Gap Enhancement in Few-Layered Tungsten Disulfide Nanosheets

“…However, synthesis of the pure and crystalline WS 2 nanosheet is very crucial. Cao et al recently reported a lightweight and high-performance microwave absorber based on 2D WS 2 –RGO heterostructures synthesized via a facile one-step hydrothermal approach, which exhibited an effective absorption bandwidth due to the interfacial dielectric coupling effect. , They have also observed the synergetic dielectric loss and magnetic loss toward microwave absorption through hybridization of WS 2 nanosheets and NiO nanoparticles. , Heterostructures of Co 3 O 4 clusters–WS 2 nanosheets as efficient microwave absorption structures were also reported, and it has been shown that the dielectric property of the WS 2 played an important role in achieving the high efficiency of the devices. − Moreover, to fabricate nanoscale devices such as LEDs, optoelectronic devices, and energy storage/generation devices, the tuning of the band gap and dielectric constant is urgently needed . However, the dielectric constant of pristine WS 2 nanosheets grown by the hydrothermal route is not yet reported.…”

A strategy based on composition control and structural design to prepare 3DOM RFCo composites with a 3D ordered macroporous structure for enhanced electromagnetic wave absorption

“…Combined with the synergistic effect of interfacial polarization and disruption of the conductive network, the high content of the Co metal leads to the decrease of the dielectric constant. 34 Notably, the e 0 and e 00 curves show multiple resonance peaks in the whole test frequency range, which indicates that the presence of abundant heterogeneous interfaces in the 3DOM structure causes enhanced interfacial polarization, resulting in a polarization relaxation process. 35 Dielectric loss tangent (tan d e = e 00 /e 0 ) represents the dielectric loss capability of the material for electromagnetic waves.…”