“Matryoshka Doll”-Like CeO<sub>2</sub> Microspheres with Hierarchical Structure To Achieve Significantly Enhanced Microwave Absorption Performance

Li, Qingqing; Liu, Jiwei; Zhao, Yunhao; Zhao, Xuebing; You, Wenbin; Xiao, Li; Che, Renchao

doi:10.1021/acsami.8b10353

Cited by 94 publications

(48 citation statements)

References 46 publications

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“…In addition, exchange resonance, natural resonance, and eddy current loss facilitate the energy absorption (Scheme 2f). [ 31 ] All of the above behaviors can significantly improve magnetic and dielectric attenuation of Co@NC MA materials by making full use of multiple loss mechanisms to achieve optimal absorption.…”

Section: Resultsmentioning

confidence: 99%

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Huang

Wang

Pei

et al. 2020

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applications in the fields of gas storage, electron conducting materials, catalysis, and sensors. [2] Nevertheless, the conductive and dielectric properties of pure MOF are too low to meet the requirement of electromagnetic (EM) impedance match. To improve the conductively and EM response capability, the thermal annealing of MOF precursors is the preferred strategy to gain the porous metal-carbonbased nanostructured materials. [3] More importantly, the final constituent of MOF derivatives can be effectively regulated by selecting the different metals sources and organic ligand. The MOF-derived hybrids can be consisted of magnetic metal oxide/ alloy, semiconductive carbon, or their composites via a facile subsequent treatment. Benefitting from the diversified composition and good chemical homogeneity, a number of efforts have been made to prove that MOFs are ideal templates or precursors for fabricating the versatile inorganic functional materials, such as graphitic carbon-encapsulated Ni nanoparticles, core-shell Fe/C nanocubes and CoSe@carbon nanoboxes. [2c,4] Based on these premises, it can be envisioned that MOF derivatives are promising and meaningful to fabricate the novel functional materials, especially in the microwave absorption (MA) field. Using a transformed strategy, MOF-derived magnetic-carbon composites can inherit the well-dispersed nanoparticles and the pristine microstructure with desirable properties.Nowadays, EM pollution issues have become increasingly serious due to the wide utilization in telecommunication, navigation, radar detector, and increasing number of electronic devices, which is an omnipresent problem that threatens our daily lives. [5] Therefore, EM absorption materials are crucial to the human protection and sophisticated equipment operation, having attracted the most extensive attention in past decades. To address these problems, searching for high-efficiency MA materials with a broadband absorption frequency and high loss capacity has stimulated huge interest in civil and military fields, especially in the gigahertz (GHz) band range. [6] It is known that the MA performance of absorbers is mainly determined by two Metal-organic framework (MOF) is highly desirable as a functional material owing to its low density, tunable pore size, and diversity of coordination formation, but limited by the poor dielectric properties. Herein, by controlling the solvent and mole ratio of cobalt/linker, multidimension-controllable MOF-derived nitrogen-doped carbon materials exhibit tunable morphology from sheet-, flower-, cube-, dodecahedron-to octahedron-like. Tunable electromagnetic parameters of Co@N-doped carbon composites (Co@NC)can be obtained and the initial MOF precursor determines the distribution of carbon framework and magnetic cobalt nanoparticles. Carbonized Co@NC compo sites possess the following advantages: i) controllable dimension and morphology to balance the electromagnetic properties with evenly charged density distribution; ii) magnetic-carbon composites offer plenty of inte...

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Section: Resultsmentioning

confidence: 99%

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Huang

Wang

Pei

et al. 2020

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“…Lately, Che et al tactfully fabricated a variety of yolk-shell CeO 2 microspheres with multiple interior cores through optimizing the solvothermal time. [108] The modifiable hierarchical structure and programmable interspaces endowed CeO 2 microspheres with tunable absorption properties.…”

Section: D Core-shell Structuresmentioning

confidence: 99%

Heterointerface Engineering in Electromagnetic Absorbers: New Insights and Opportunities

et al. 2021

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Electromagnetic (EM) absorbers play an increasingly essential role in the electronic information age, even toward the coming “intelligent era”. The remarkable merits of heterointerface engineering and its peculiar EM characteristics inject a fresh and infinite vitality for designing high‐efficiency and stimuli‐responsive EM absorbers. However, there still exist huge challenges in understanding and reinforcing these interface effects from the micro and macro perspectives. Herein, EM response mechanisms of interfacial effects are dissected in depth, and with a focus on advanced characterization as well as theoretical techniques. Then, the representative optimization strategies are systematically discussed with emphasis on component selection and structural design. More importantly, the most cutting‐edge smart EM functional devices based on heterointerface engineering are reported. Finally, current challenges and concrete suggestions are proposed, and future perspectives on this promising field are also predicted.

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“…Besides, the MA performance relies intrinsically on the corresponding configuration, since the single component material cannot meet the practical request with strong MA attenuation, wide‐band frequency response, and low density. Various semiconductors, featuring the tunable dielectric and magnetic behaviors, have been widely investigated in the application of the MA absorbers . Titanium dioxide (TiO 2 ), a typical dielectric material, can make the impedance matching to trap more incident electromagnetic wave.…”

Section: Introductionmentioning

confidence: 99%

Boosted Interfacial Polarization from Multishell TiO₂@Fe₃O₄@PPy Heterojunction for Enhanced Microwave Absorption

Ding

Wang

Zhao

et al. 2019

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Core@shell structures have been attracting extensive attention to boost microwave absorption (MA) performance due to the unique interfacial polarization. However, it still remains a challenge to synthesize sophisticated 1D semiconductor‐based materials with excellent MA competence. Herein, a hierarchical cable‐like TiO2@Fe3O4@PPy is fabricated by a sequential process of solvothermal treatment and polymerization. The complex permittivity of ternary composites can be optimized by tunable PPy coating thickness to improve the loss ability. The maximum reflection loss can reach −61.8 dB with a thickness of 3.2 mm while the efficient absorption bandwidth can achieve over 6.0 GHz, which involves the X and Ku band at only a 2.2 mm thickness. Importantly, the heterojunction contacts constructed by PPy–Fe3O4 and Fe3O4–TiO2 contribute to the enhanced polarization loss. Besides, the configuration of magnetic Fe3O4 sandwiched between dielectric TiO2 and PPy facilitates the magnetic stray field to radiate into the TiO2 core and out of the PPy shell, which significantly promotes magnetic–dielectric synergy. Electron holography validates the distinct charge distribution and magnetic coupling. The new findings might shed light on novel structures for functional core@shell composites and the design of semiconductor‐based materials for microwave absorption.

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“Matryoshka Doll”-Like CeO₂ Microspheres with Hierarchical Structure To Achieve Significantly Enhanced Microwave Absorption Performance

Cited by 94 publications

References 46 publications

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Heterointerface Engineering in Electromagnetic Absorbers: New Insights and Opportunities

Boosted Interfacial Polarization from Multishell TiO₂@Fe₃O₄@PPy Heterojunction for Enhanced Microwave Absorption

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“Matryoshka Doll”-Like CeO2 Microspheres with Hierarchical Structure To Achieve Significantly Enhanced Microwave Absorption Performance

Cited by 94 publications

References 46 publications

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Multidimension‐Controllable Synthesis of MOF‐Derived Co@N‐Doped Carbon Composite with Magnetic‐Dielectric Synergy toward Strong Microwave Absorption

Heterointerface Engineering in Electromagnetic Absorbers: New Insights and Opportunities

Boosted Interfacial Polarization from Multishell TiO2@Fe3O4@PPy Heterojunction for Enhanced Microwave Absorption

Contact Info

Product

Resources

About

“Matryoshka Doll”-Like CeO₂ Microspheres with Hierarchical Structure To Achieve Significantly Enhanced Microwave Absorption Performance

Boosted Interfacial Polarization from Multishell TiO₂@Fe₃O₄@PPy Heterojunction for Enhanced Microwave Absorption