Controllable heterogeneous interfaces of cobalt/carbon nanosheets/ rGO composite derived from metal-organic frameworks for high-efficiency microwave attenuation

Wang, Yan; Di, Xiaochuang; Lu, Zhao; Cheng, Runrun; Wu, Xinming; Gao, Peihu

doi:10.1016/j.carbon.2021.11.027

Cited by 100 publications

(15 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure S4 shows the two-dimensional RL diagram of the samples, reflecting the change of absorption performance with thickness. The absorption peak moved to the low frequency with increased thickness, which indicated that it accorded with the quarter wavelength matching model. − …”

Section: Resultssupporting

confidence: 55%

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption

Zeng

Qiao

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

A type of hollow core–shell ZnO/Fe3O4@C fibers were fabricated by a facile combination of electrospinning, calcination, and pyrolytic pyrrole-derived carbon coating. The combination of ZnO/Fe3O4 fibers and carbon nanolayer improved the dielectric loss capability of the nanocomposites and obtained good impedance matching, leading to excellent electromagnetic wave (EMW) absorption performance. The minimum reflection loss of the ZnO/Fe3O4@C nanocomposites reached −74.2 dB at a thickness of merely 2.2 mm, and the effective absorption bandwidth reached 5.5 GHz at a matching thickness of 2.1 mm. Compared with the ZnO- or Fe3O4-based composites ever reported, our ZnO/Fe3O4@C nanocomposites exhibited superior EMW absorption characteristics due to the efficient design of multiple synergistical components and hollow fibrous structures. Combined with the facile, scalable preparation approach, the hollow core–shell ZnO/Fe3O4@C nanocomposite fibers with high EMW absorption performance show great potential for EMW absorption applications.

show abstract

Section: Resultssupporting

confidence: 55%

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption

Zeng

Qiao

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Deconvolution of the C 1s spectra (Figure d) into three diffraction peaks with energies centered at 287.08, 285.28, and 284.08 eV, belonging to C–O, C–N, and C–C groups, occurred. As illustrated in Figure e, two distinct peaks are identified at 795.98 and 780.38 eV, which are from Co 2P 1/2 and Co 2p 3/2 , , respectively. Furthermore, two satellite peaks can be observed at 801.18 and 785.48 eV.…”

Section: Resultsmentioning

confidence: 95%

Hierarchical Multi-Core–Shell CoNi@Graphite Carbon@Carbon Nanoboxes for Highly Efficient Broadband Microwave Absorption

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The rational construction of a core–shell structure has been widely used in the design of absorbing materials for improved impedance and attenuation matching. However, for traditional absorbing core–shell materials, it is crucial to further regulate the morphology and composition of the core after encapsulation, to realize further improvement in absorbing performance. In this work, heterogeneous multi-core–shell CoNi@graphite carbon@carbon (hereinafter referred to as CGC) nanocomposites have been fabricated via the polymerization of dopamine on the surface of cobalt-nickel Prussian blue analogues and subsequent carbonization. Because of the effect of metal catalytic graphitization, the CoNi alloy formed during high-temperature carbonization promotes the transitional process from amorphous carbon to graphite, thus forming a multi-core–shell structure with the CoNi alloy coated with graphite carbon as the core and amorphous carbon as the shell. Notably, the as-prepared CGC nanocomposites with an optimized paraffin loading ratio exhibit superior electromagnetic wave (EMW) absorbing capacity, reaching a minimum reflection loss value of −56.78 dB at 14.76 GHz with a thickness of 2.0 mm, much better than that of most magnetic carbon-based absorbing materials as reported previously. Furthermore, the effective bandwidth goes across 5.51 dB (12.34–17.85 GHz), therefore enriching the absorbing application in the Ku band. As a result, the superior impedance and attenuation matching derived from the heterogeneous multi-core–shell structure and multiple electromagnetic loss components make CGC a promising EMW absorbing material.

show abstract

“…In general, the detailed dissipation microwave mechanism of Co/Co 3 O 4 @HCNs is closely related to matched impedance, enhanced dielectric polarization, improved magnetic loss as well as the synergistic loss capacity, which can be systematically clarified as follows [ 42 – 44 ]. First, it is reasonable to speculate that these Co/Co 3 O 4 derivatives embedded inside carbon matrix favor dielectric–magnetic balance, and hollow engineering drastically decreases the interfacial impedance gap at the interface of absorbers–air [ 45 ], and both of them result in optimized impedance characteristic and less backscattered microwave, which is the critical precondition for subsequent microwave attenuation.…”

Section: Resultsmentioning

confidence: 99%

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

et al. 2022

View full text Add to dashboard Cite

Precisely reducing the size of metal-organic frameworks (MOFs) derivatives is an effective strategy to manipulate their phase engineering owing to size-dependent oxidation; however, the underlying relationship between the size of derivatives and phase engineering has not been clarified so far. Herein, a spatial confined growth strategy is proposed to encapsulate small-size MOFs derivatives into hollow carbon nanocages. It realizes that the hollow cavity shows a significant spatial confinement effect on the size of confined MOFs crystals and subsequently affects the dielectric polarization due to the phase hybridization with tunable coherent interfaces and heterojunctions owing to size-dependent oxidation motion, yielding to satisfied microwave attenuation with an optimal reflection loss of −50.6 dB and effective bandwidth of 6.6 GHz. Meanwhile, the effect of phase hybridization on dielectric polarization is deeply visualized, and the simulated calculation and electron holograms demonstrate that dielectric polarization is shown to be dominant dissipation mechanism in determining microwave absorption. This spatial confined growth strategy provides a versatile methodology for manipulating the size of MOFs derivatives and the understanding of size-dependent oxidation-induced phase hybridization offers a precise inspiration in optimizing dielectric polarization and microwave attenuation in theory.

show abstract

Controllable heterogeneous interfaces of cobalt/carbon nanosheets/ rGO composite derived from metal-organic frameworks for high-efficiency microwave attenuation

Cited by 100 publications

References 59 publications

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption

Hierarchical Multi-Core–Shell CoNi@Graphite Carbon@Carbon Nanoboxes for Highly Efficient Broadband Microwave Absorption

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

Contact Info

Product

Resources

About

Controllable heterogeneous interfaces of cobalt/carbon nanosheets/ rGO composite derived from metal-organic frameworks for high-efficiency microwave attenuation

Cited by 100 publications

References 59 publications

Hollow ZnO/Fe3O4@C Nanofibers for Efficient Electromagnetic Wave Absorption

Hollow ZnO/Fe3O4@C Nanofibers for Efficient Electromagnetic Wave Absorption

Hierarchical Multi-Core–Shell CoNi@Graphite Carbon@Carbon Nanoboxes for Highly Efficient Broadband Microwave Absorption

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

Contact Info

Product

Resources

About

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption

Hollow ZnO/Fe₃O₄@C Nanofibers for Efficient Electromagnetic Wave Absorption