Selective coding dielectric genes based on proton tailoring to improve microwave absorption of MOFs

Tao, Jiaqi; Xu, Linling; Jin, Haoshan; Gu, Yansong; Zhou, Jintang; Yao, Zhengjun; Tao, Xinyong; Chen, Pïng; Wang, Dinghui; Li, Zhong; Wu, Hongjing

doi:10.1016/j.apmate.2022.100091

Cited by 55 publications

(23 citation statements)

References 57 publications

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“…[4,5] Currently, substantial the sp 2 hybrid carbon, thus improving the electronic limiting density and strengthening the conduction loss, while pyridinic N and pyrrolic N located at edge sites mainly involved in dipolar polarization. [20][21][22][23] Not limited to a single element, a system in which multiple elements coexist may produce a synergistic coupling effect of electronic interactions. [24] N/S dual-doped TiO 2 exhibits higher heteroatom concentration and stronger carrier migration capacity than single doping.…”

Section: Introductionmentioning

confidence: 99%

Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption

Tao

Pei

et al. 2022

Adv Funct Materials

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100

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Heteroatom doping engineering is desirable in tuning crystal structures and electrical properties, which is considered an opportunity to further develop microwave absorption materials. However, the competition mechanism and priority among doped atoms have not been revealed, which are insufficient to guide the most reasonable dielectric coupling model and design highperformance absorbers. In this work, based on in situ N and O, ex situ S is introduced through external thermal driving, leading to fierce competition among anions. Specifically, S atoms replace pyrrole N, drive out lattice O, and create O vacancies, bringing more extensive local charge redistribution and stronger electron interaction, thus activating the defect-induced polarization (3-6 times higher than conduction loss) in the middle/high-frequency region. Therefore, the effective absorption bandwidth (EAB) of 9.03 GHz and the minimum reflection loss (RL min ) of −64.05 dB at a filling rate of 10 wt.% are obtained, which improves the record of carbon absorbers as reported. Through macro-designs, i.e., multi-layer gradient metamaterial, or utilizing other advantages, e.g., cost-effective, stable chemical properties and wideangle absorption, porous carbon may possess a great application prospect in the naval field.

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Section: Introductionmentioning

confidence: 99%

Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption

Tao

Pei

et al. 2022

Adv Funct Materials

Self Cite

100

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“…Impressively, the model containing the absorber shows little variation over the range −60°–60°, and the overall stability of the curve is excellent, indicating that it is well suited for complex angular EMW incidence environments. [ 46 ] The RCS values for the pure absorber were further calculated by subtracting the red line from the black PEC line (Figure 3p), which exhibits an optimal value of −38.6 dBm 2 (1/1000 of original shape) at ± 8°. [ 47 ] Results of the simulations are consistent with the experimental RL properties, demonstrating the great potential of Ni‐SAs3/NC as an EMW absorber for practical applications.…”

Section: Resultsmentioning

confidence: 99%

“…First, both the magnitude and the variation of the permeability tangent (tan δ µ ) are much smaller than that of permittivity tangent (tan δ ε ), indicating that the magnetic loss plays only an auxiliary role in the overall electromagnetic loss mechanism (Figure S13, Supporting Information). [30,46] Hence, the weak magnetic loss forces us to turn to the investigation of the complex permittivity (ε', ε"), which is directly related to the dielectric loss.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Ni 3d Orbital Unpaired Electrons Induced Polarization Loss Based on Ni Single‐Atoms Model Absorber

Liang

Chen

Liu

et al. 2022

Adv Funct Materials

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104

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Single-atoms (SAs) strategies have been proved to be effective in modulating electromagnetic wave (EMW) absorption, however, the establishment of a definitive relationship between metal SAs electronic configurations and physical loss mechanisms has been still absent, especially on the atomic scale. Herein, stable Ni-SAsx/N-doped carbon (NC) absorbers are fabricated with the strategy of ligand polymerization. The morphology, composition, electrical conductivity, defects, and electronic interactions of the material can be well tailored by Ni species modulation engineering. Theoretical and experimental results show that the atomically dispersed individual Ni atoms contribute to enhanced EMW absorption performance through excess Ni 3d orbital unpaired electron induced polarization loss. Benefiting from it, Ni-SAs3/NC with the highest Ni SAy-Nx (y > 1, x > 1) polar/defect centers exhibit excellent EMW absorption with an effective absorption bandwidth of 7.08 GHz at a matched thickness of 2.50 mm. Radar cross-section simulations further demonstrate its potential for practical application as EMW absorber. This study reveals the continuous evolution of microscopic electromagnetic loss mechanism (i.e., conduction loss→ unique polarization loss→ conduction loss) for the first time, which provides insight into the deep design of absorbers from atom-scale view.

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“…that the defect configuration transition from heterostructures to vacancy and void geometries increases the polarizationdependent dielectric genes. [168] The hollow MOF-derived materials can be fabricated through distinct shrinkage and nano-Kendall effect. According to the different thermal stability of ZIF-8 and ZIF-67, the hollow carbon nanocages composed of N-doped carbon inner shell and Co/Ndoped carbon outer shell (NC@Co/NC) were constructed through directly pyrolysis of core-shell ZIF-8@ZIF-67 polyhedrons (Figure 13e).…”

Section: Hollow Structurementioning

confidence: 99%

“…The results demonstrate that the defect configuration transition from heterostructures to vacancy and void geometries increases the polarization‐dependent dielectric genes. [ 168 ]…”

Section: Microstructure Engineering Of Mof‐derived Materialsmentioning

confidence: 99%

Architectural Design and Microstructural Engineering of Metal–Organic Framework‐Derived Nanomaterials for Electromagnetic Wave Absorption

et al. 2022

Small Structures

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Metal–organic frameworks (MOFs) derivatives are developing family of functional materials for electromagnetic wave (EMW) absorption. Their tailored structures, controllable compositions, high porosity, and versatile functions offer immense advantages for the construction of excellent EMW absorption materials. Nevertheless, it is crucial and challenging to understand the unique role of rationally designing art and tailoring the microstructures of MOF‐derived materials for EMW absorption. In this review, advances in rational architectural design strategy and the elaborate control of microstructures are outlined to promote the EMW absorption performance of MOF‐derived materials. In addition, the derived key information regarding the superiority and composition–structure–performance relationships of the engineered MOF‐derived materials with advanced components and nanostructures is comprehensively summarized. Finally, the insight into the challenges of future development in MOF‐derived EMW absorption materials is presented.

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Selective coding dielectric genes based on proton tailoring to improve microwave absorption of MOFs

Cited by 55 publications

References 57 publications

Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption

Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption

Exploring the Ni 3d Orbital Unpaired Electrons Induced Polarization Loss Based on Ni Single‐Atoms Model Absorber

Architectural Design and Microstructural Engineering of Metal–Organic Framework‐Derived Nanomaterials for Electromagnetic Wave Absorption

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