Confined Magnetic‐Dielectric Balance Boosted Electromagnetic Wave Absorption. Issue 30 (18th June 2021)

• Record Type: Journal Article
• Authors: Wang, Lei; Huang, Mengqiu; Qian, Xiang; Liu, Lili; You, Wenbin; Zhang, Jie; Wang, Min; Che, Renchao
• Is Part Of: Small. Volume 17:Issue 30(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-18
• Subjects: confined effect -- electromagnetic balance -- metal‐organic frameworks -- microwave absorption -- polarization; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202100970
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Magnetic‐dielectric property plays a critical significance for the functional expression toward advanced materials. Within nanoscale, the simultaneous regulation of the electrical and magnetic properties of electromagnetic (EM) wave absorption materials faces huge challenges. Herein, using the metal‐organic frameworks (MOF) as templates, highly‐dispersed ZnO and Co nanoparticles are uniformly confined inside graphited N‐doped carbon skeleton, constructing the balanced EM property in the Co@NC‐ZnO absorbers. Meanwhile, a dynamics and symmetrical morphology optimization of MOF‐derived Co@NC‐ZnO are dependent on the Co/Zn mass ratio and adjusting MOF frameworks, which evolves from the cube, truncated cube, dodecahedron, and to the final microsphere. Simultaneously, both the electronic conduction network and magnetic coupling network are compatible together in the in situ transformed Co@NC‐ZnO system. Boosted magnetic responding ability and unique magnetic coupling are verified by the off‐axis electronic holography. Plentiful heterojunction interfaces and special electronic conduction paths can be built in this Co‐Zn‐MOF derivatives, facilitating the dielectric loss behaviors. As expected, MOF‐derived Co@NC‐ZnO absorber displays outstanding EM wave absorption ability with strongest reflection loss value of −69.6 dB at only 1.9 mm thickness and wideband absorption covering 6.8 GHz at 2.4 mm. Confined EM balance provides new design strategy toward MOF‐derived excellent MA materials and functional devices. Abstract : Confined electromagnetic (EM) balance provides a new design strategy toward MOF‐derived functional materials and devices. Highly‐dispersed ZnO and Co nanoparticles are uniformly confined inside graphited N‐doped carbon skeleton, constructing the balanced EM property in the Co@NC‐ZnO absorbers. MOF‐derived Co@NC‐ZnO absorber displayed outstanding EM wave absorption ability with the strongest reflection loss and wideband absorption frequency.