3D porous coral-like Co1.29Ni1.71O4 microspheres embedded into reduced graphene oxide aerogels with lightweight and broadband microwave absorption

Qiu, Jun-Feng; Cao, Haopeng; Du, Rongxiao; Dou, Kai; Tsidaeva, Natalia; Wang, Wei

doi:10.1016/j.jcis.2021.11.176

Cited by 53 publications

(6 citation statements)

References 55 publications

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“…The performance comparison about EAB and filler content of this work to other reported rGO-based aerogels has been given in Fig. 3h [23,[44][45][46][47][48][49][50]. Most of reported works had higher filler contents or smaller EAB.…”

Section: Microwave Absorption Performancementioning

confidence: 69%

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

et al. 2022

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Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still a problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide to obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that the phase components (rGO and CuS phases) and micro/nano structure (microporous and nanosheet) were well-modified by modulating the additive amounts of CuS and changing the reduction ways, which resulted in the variation of the pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) reduction value and infrared (IR) emissivity. Notably, the obtained CuS@rGO aerogels with a single dielectric loss type can achieve an ultrabroad bandwidth of 8.44 GHz at 2.8 mm with the low filler content of 6 wt% by a hydrothermal method. Besides, the composite aerogel via the ascorbic acid reduction realizes the minimum reflection loss (RLmin) of − 60.3 dB with the lower filler content of 2 wt%. The RCS reduction value can reach 53.3 dB m2, which effectively reduces the probability of the target being detected by the radar detector. Furthermore, the laminated porous architecture and multicomponent endowed composite aerogels with thermal insulation and IR stealth versatility. Thus, this work offers a facile method to design and develop porous rGO-based composite aerogel absorbers with radar-IR compatible stealth.

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Section: Microwave Absorption Performancementioning

confidence: 69%

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

et al. 2022

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“…The XPS results of GFs and GO are shown in Figure . Figure a shows that the peak intensity ratio of C1s to O1s of GO is significantly lower than that of GFs This can be attributed to the removal of many oxygen-containing functional groups during the hydrothermal reduction of GO . In Figure b,c, the C 1s spectra of GO and GF-80 exhibit three characteristic peaks at 284.8, 286.2, and 288.7 eV, which can be attributed to the C–C/CC, C–O, and CO bonds, respectively …”

Section: Resultsmentioning

confidence: 91%

“…Figure 5a shows that the peak intensity ratio of C1s to O1s of GO is significantly lower than that of GFs This can be attributed to the removal of many oxygen-containing functional groups during the hydrothermal reduction of GO. 27 In Figure 5b,c, the C 1s spectra of GO and GF-80 exhibit three This can be attributed to the removal of some oxygencontaining functional groups during the hydrothermal reduction process of GO. Figure 5d shows the deconvolution plot of the O1s spectrum of GF-80.…”

Section: ■ Experimental Sectionmentioning

confidence: 91%

Novel Preparation of Graphene Foam with Adjustable Dielectric Properties for Efficient Microwave Absorption

Liu¹,

Wang²,

Wei³

et al. 2023

Langmuir

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Graphene foams (GFs) prepared via a hydrothermal method can be vacuum-dried directly without the need for freezing by adding naphthalene to the graphene hydrogels. By optimizing the GF preparation process, it is also possible to adjust the GF’s dielectric properties by varying the amount of naphthalene added. Based on the comparison results, it was observed that controlling the addition of naphthalene could also modify the internal structure of GF and effectively regulate its dielectric properties. GF-80, synthesized with 80 g of naphthalene, exhibited exceptional microwave absorption (MA) performance. At a mass content of only 2% and a matching thickness of 3.38 mm, a minimum reflection loss (RLmin) of −55.89 dB was achieved. Moreover, GF-80, with a thickness of 2.31 mm, was shown to achieve a bandwidth of RL less than −10 dB across 6.88 GHz.

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“…Additionally, the EAB of all CNCA absorbers surpasses 3 GHz with a thickness of 2 mm. Figure b summarizes the RL values and corresponding thicknesses of carbon-based or MXene-based composite EMW absorbers reported in the previous study. ,,,,,,,,,− Additionally, the corresponding specific values are presented in Table S1. By contrast, CNCA-2 displays a relatively high RL value, low filler ratio, and thin thickness, indicating that the Co/Nb 2 CT x /carbon aerogel composite possesses promising application prospects as an ultrathin, lightweight, and strong absorption absorber.…”

Section: Resultsmentioning

confidence: 99%

“…For example, hollow, − core–shell, , yolk–shell, , porous (foam and/or aerogel), − and hierarchical structures have been constructed to obtain excellent EMW absorption with a low filler ratio and thin thickness because these microstructures usually possess low density and can provide much interfacial polarization and multiple scattering to accelerate the attenuation of EMW. Currently, three-dimensional (3D) porous materials have attracted considerable interest to fabricate efficient EMW absorbers due to their large surface area and abundant void structure, which contribute to optimizing impedance matching and improving the reflection and scattering of EMW. − Additionally, porous materials generally exhibit a superior thermal insulation effect and further realize thermal infrared stealth property due to high porosity, 3D network skeleton, and air phase with ultralow thermal conductivity. Therefore, porous materials have become a research hotspot in the field of multifunctional EMW absorption.…”

Section: Introductionmentioning

confidence: 99%

Architecture Design of a Bamboo Cellulose/Nb₂CT_x MXene/ZIF-67-Derived Lightweight Co/Nb₂CT_x/Carbon Aerogel for Highly Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardant

Cui

Geng²,

Jiang

et al. 2023

Ind. Eng. Chem. Res.

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Designing biomass-derived carbon-based lightweight electromagnetic wave (EMW) absorbers with multiple functions is promising research. However, the design of carbon-based EMW absorbers with multifunctionality for practical application remains a substantial challenge. Herein, a porous architecture engineering strategy was used to prepare a high-performance EMW absorption composite material with thermal insulation and flame-retardant properties The multifunctional Co/Nb2CT x /carbon aerogel with porous architecture composed of a bamboo-derived carbon aerogel, two-dimensional (2D) Nb2CT x , and ZIF-67-derived Co nanoparticles was prepared. Bamboo cellulose and few-layered Nb2CT x MXene constructed the three-dimensional (3D) aerogel architecture, ZIF-67 was then uniformly anchored on the aerogel skeleton through chemical deposition, and the Co/Nb2CT x /carbon aerogel was finally prepared by pyrolysis. The 3D interconnected network heterostructure not only contributes to conduction loss but also prolongs multiple reflection and scattering paths of EMW, which can improve the dielectric loss. Nb2CT x and Co nanoparticles play an important part in modulating the impedance matching and promoting the EMW attenuation ability due to the plenty of dipole/interfacial polarization loss and supplementary magnetic loss. The obtained Co/Nb2CT x /carbon aerogel possesses low density (54.03 mg cm–3) and achieves excellent reflection loss and broad effective absorption bandwidth (−60.25 dB and 4 GHz, respectively) at an ultrathin thickness of 1.67 mm with an ultralow filling content of 10 wt %. The radar cross section (RCS) reduction value can reach 31.24 dB m–2, indicating that the absorber can effectively reduce the probability of the target being detected by the radar detector. The strategy of porous architecture engineering provides guidance for the design of biomass-based electromagnetic wave absorption materials with thermal insulation property and flame-retardant capacity.

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3D porous coral-like Co1.29Ni1.71O4 microspheres embedded into reduced graphene oxide aerogels with lightweight and broadband microwave absorption

Cited by 53 publications

References 55 publications

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Novel Preparation of Graphene Foam with Adjustable Dielectric Properties for Efficient Microwave Absorption

Architecture Design of a Bamboo Cellulose/Nb₂CT_x MXene/ZIF-67-Derived Lightweight Co/Nb₂CT_x/Carbon Aerogel for Highly Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardant

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3D porous coral-like Co1.29Ni1.71O4 microspheres embedded into reduced graphene oxide aerogels with lightweight and broadband microwave absorption

Cited by 53 publications

References 55 publications

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Novel Preparation of Graphene Foam with Adjustable Dielectric Properties for Efficient Microwave Absorption

Architecture Design of a Bamboo Cellulose/Nb2CTx MXene/ZIF-67-Derived Lightweight Co/Nb2CTx/Carbon Aerogel for Highly Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardant

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Architecture Design of a Bamboo Cellulose/Nb₂CT_x MXene/ZIF-67-Derived Lightweight Co/Nb₂CT_x/Carbon Aerogel for Highly Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardant