Facile synthesis of cobalt-zinc ferrite microspheres decorated nitrogen-doped multi-walled carbon nanotubes hybrid composites with excellent microwave absorption in the X-band

Shu, Ruiwen; Wu, Yue; Li, Zhenyin; Zhang, Jiabin; Wan, Zongli; Liu, Yin; Zheng, Min

doi:10.1016/j.compscitech.2019.107839

Cited by 112 publications

(33 citation statements)

References 69 publications

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“…Impedance matching determines the microwave energy entering the microwave absorber system. [46,47] Impedance matching can determine the microwave energy entering the inside of the absorbing material, and the attenuation ability is related to the energy dissipated by the absorbing material. In order to clearly illustrate the microwave properties of CeO 2−x /RGO composites, we calculate the impedance matching degree (Z) and attenuation constant (α) at 2.0 mm.…”

Section: Microwave Absorption Properties Of Accordion-like Ceo 2−x /Rmentioning

confidence: 99%

“…Thus, the interface between RGO and CeO 2−x NPs can be equivalent to resistorcapacitor circuit model (Figure 8b). [30,46,54] This interface leads to high density of charge accumulation, resulting in abundant dipole polarization sites (Figure 8c). [46] The CeO 2−x NPs and air between each two lamellas can be considered as the dielectric for energy storage (ε′) and consumption (ε″).…”

Section: Dipole Polarizationmentioning

confidence: 99%

“…[30,46,54] This interface leads to high density of charge accumulation, resulting in abundant dipole polarization sites (Figure 8c). [46] The CeO 2−x NPs and air between each two lamellas can be considered as the dielectric for energy storage (ε′) and consumption (ε″). The accordionlike structure which consists of large number of lamellas ( Figure 2) can be considered as large number of series capacitors ( Figure 8b).…”

Section: Dipole Polarizationmentioning

confidence: 99%

“…The residual oxygen functional groups and structural defects of RGO can generate abundant dipole polarization. [46,55,56] The RGO with high conductivity promotes the conduction loss within RGO sheet. In general, the ε′ and ε″ of an ideal microwave absorber is required to be smaller than 30 and 15, respectively.…”

Section: Effects Of Components and Laminated Structurementioning

confidence: 99%

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MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

Zhao

et al. 2020

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102

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Three‐dimensional (3D) materials assembled by 2D layered lamella can provide abundant interfaces which are greatly advantageous for high‐performance microwave absorbers. Herein, accordion‐like CeO2−x/reduced graphene oxide (CeO2−x/RGO) hybrid materials can be successfully synthesized by a solvothermal and hydrothermal method, which are composed of laminated RGO sheets and confined CeO2−x nanoparticles (NPs). The multilayer structure is attributed to the process of Ce‐MOF dissolving into NPs, then the NPs combining with graphene oxide (GO) to induce the 2D GO assembled into 3D accordion‐like composites. The 3D accordion‐like CeO2−x/RGO simultaneously utilizes the insulated CeO2−x and highly conductive RGO to assemble into the laminated structure with moderate electromagnetic parameters. The 3D‐laminated lightweight CeO2−x/RGO composite exhibits excellent attenuation ability of an ultrabroad bandwidth (5.84 GHz) and a maximum reflection loss (−50.6 dB) which can be ascribed from the glorious impedance matching, synergistic effect between RGO sheets and the embedded CeO2−x NPs. An off‐axis electron holography is carried out to visualize the spatial electrical potential and charge distribution around the CeO2−x/RGO heterojunction, which clarifies the dipole polarization and interfacial polarization. This work enlightens a simple strategy to fabricate an excellent 3D laminated RGO‐based microwave absorber.

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Section: Microwave Absorption Properties Of Accordion-like Ceo 2−x /Rmentioning

confidence: 99%

Section: Dipole Polarizationmentioning

confidence: 99%

Section: Dipole Polarizationmentioning

confidence: 99%

Section: Effects Of Components and Laminated Structurementioning

confidence: 99%

See 2 more Smart Citations

MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

Zhao

et al. 2020

Small

102

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“…Microwave absorbing materials are mainly used in the following areas: military stealth; electromagnetic radiation protection of radio and television stations; electromagnetic radiation protection of industrial, scientific, and medical equipment; electromagnetic radiation protection of household appliances; and electromagnetic radiation protection of office and residential areas. Among varieties of conventional absorbers-ferrite, carbonyl iron powder, magnetic metal nanoparticles, carbon materials, and conductive polymer, for instance-carbon composites absorbers are one of the most cost-effective microwave absorbers because of their chemical and thermal stability, low price, light weight, and controllable micro-structure [3][4][5]. In particularly, materials with a porous multi-interface structure have been considered as potential candidates in many fields owing to their multiple interfaces [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption

Jin

Zhang

et al. 2020

Nanomaterials

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A facile method for the preparation of microwave absorbers with low density, high microwave absorptivity, and broad band is of paramount importance to the progress in practical application. Herein, commonly-used metal organic frameworks (MOFs) prepared just by mechanical stirring in methanol at room temperature were chosen as sacrificial templates to synthesize porous carbon composites with tunable dielectric and magnetic properties. With the replacement of Co atoms on the surface of zeolitic imidazolate framework-67 (ZIF-67) by Zn atoms, a Co-doped porous carbon composite with a low-dielectric amorphous carbon/Zn shell was constructed after annealing, leading to excellent impedance matching condition. Consequently, the as-obtained composite (Co/C@C-800) shows marvelous microwave absorption properties with an absorption capacity of −43.97 dB and a corresponding effective absorption bandwidth of 4.1 GHz, far exceeding that of the traditional porous carbon and composites directly derived from ZIF-67. The results provide a convenient way to modify MOFs for enhanced microwave absorption materials from the synergy of dielectric and magnetic losses.

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Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

Shu

Zhang

et al. 2020

Adv Elect Materials

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110

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Heteroatom nitrogen doping is considered an effective strategy to enhance the electromagnetic wave (EMW) absorption capacity of reduced graphene oxide (RGO). Herein, nitrogen‐doped RGO aerogels (NGAs) are synthesized via hydrothermal self‐assembly followed by lyophilization processes. Results of micromorphology analysis show that the as‐prepared NGAs display unique 3D porous and netlike structure. Moreover, the effects of nitrogen doping and filler contents on EMW absorption properties of NGAs are studied. The as‐synthesized NGA with nitrogen content of 9.41 at% and a bulk density of 8.7 mg cm–3 presents the integrated optimal EMW absorption performance. Specifically, the minimum reflection loss of –56.4 dB is achieved and maximum absorption bandwidth of 6.8 GHz is reached, covering the whole Ku band. In addition, the possible EMW absorption mechanisms of obtained NGAs are proposed. Therefore, the as‐synthesized NGAs can be exploited as promising high‐efficiency and lightweight EMW absorbers.

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Facile synthesis of cobalt-zinc ferrite microspheres decorated nitrogen-doped multi-walled carbon nanotubes hybrid composites with excellent microwave absorption in the X-band

Cited by 112 publications

References 69 publications

MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption

Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

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