Preparation and evaluation of the microwave absorption properties of template-free graphene foam-supported Ni nanoparticles

Xiong, Liangliang; Yu, Mei; Liu, Jianhua; Li, Songmei; Xue, Bing

doi:10.1039/c6ra27435h

Cited by 56 publications

(34 citation statements)

References 56 publications

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“…Figure 7 presents RL curves for S1, S2, and S3 at various thicknesses, each with filler loadings of 30 wt%. It is clear that with an increase in thickness, the RL peaks move toward the lower frequency region, and this is consistent with other reports [2,37]. All samples are consistent with quarter- RL values are usually used to assess the performance of MA materials.…”

Section: Resultssupporting

confidence: 90%

“…All samples are consistent with quarter- RL values are usually used to assess the performance of MA materials. These values can be calculated according to transmission line theory, and the equations are as follows [2,34]:…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, a wide usage of electronic equipment has caused more and more electromagnetic pollution [1][2][3]. Long-term exposure to this pollution will cause specific harm to human health, and will also interfere with the operation of sensitive electronic equipment in civil and military fields [4].Thus, microwave absorption (MA) materials are urgently needed to attenuate superfluous electromagnetic (EM) energies [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Han

Zhang

et al. 2020

Nanomaterials

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The reasonable design of magnetic carbon-based composites is of great significance to improving the microwave absorption (MA) performance of the absorber. In this work, ultrafine FeNi3 nanocrystals (5–7 nm) embedded in a 3D honeycomb-like carbon matrix (FeNi3@C) were synthesized via a facile strategy that included a drying and carbonization process. Because of the soft magnetic property of the FeNi3 nanocrystals and their unique 3D honeycomb-like structure, the FeNi3@C composites exhibit excellent MA abilities. When the filler loading ratio of FeNi3@C/paraffin composites is only 30 wt%, the maximum reflection loss (RL) value is −40.6 dB at 10.04 GHz. Meanwhile, an ultra-wide absorption frequency bandwidth of 13.0 GHz (5.0–18.0 GHz over −10 dB) can be obtained in the thickness range of 2.0–4.5 mm, and this means that the absorber can consume 90% of the incident waves. It benefits from the dual loss components, multiple polarizations, and multiple reflections for improving MA performances of FeNi3@C composites. These observations suggest that the 3D honeycomb-like FeNi3@C composites have broad application prospects in exploring new MA materials that have a wide frequency bandwidth and strong absorption.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Han

Zhang

et al. 2020

Nanomaterials

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“…Utilizing microwaves also provides more advantages than conventional heating including a rapid process heating, reduced processing time and work space, more accurate and uniform heating, and high quality [8][9][10][11]. In contrast, microwave heating has limitations and technical problems such as selection of the type of materials with a broad adsorption bandwidth that strongly absorb microwaves [12]. As a result, an extensive study is required on the application of microwave setup to optimize and improve the methane-reforming process in terms of conversion and product selectivity.…”

Section: Ch 4 + Co 2 ⇔ 2co + 2hmentioning

confidence: 99%

Application of Microwave in Hydrogen Production from Methane Dry Reforming: Comparison Between the Conventional and Microwave-Assisted Catalytic Reforming on Improving the Energy Efficiency

et al. 2019

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The microwave-assisted dry reforming of methane over Ni and Ni–MgO catalysts supported on activated carbon (AC) was studied with respect to reducing reaction energy consumption. In order to optimize the reforming reaction using the microwave setup, an inclusive study was performed on the effect of operating parameters, including the type of catalysts’ active metal and their concentration in the AC support, feed flow rate, and reaction temperature on the reaction conversion and H2/CO selectivity. The methane dry reforming was also carried out using conventional heating and the results were compared to those of microwave heating. The catalysts’ activity was increased under microwave heating and as a result, the feed conversion and hydrogen selectivity were enhanced in comparison to the conventional heating method. In addition, to improve the reactants’ conversion and products’ selectivity, the thermal analysis also clarified the crucial importance of microwave heating in enhancing the energy efficiency of the reaction compared to the conventional heating.

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“…[14][15][16][17] In addition, magnetic nanoparticles (Fe, Co, Ni) can also be combined with graphene to form composite materials, and have a signicant effect in the eld of EM wave absorption. [18][19][20][21][22] Among them, the research on Ni is the most. Chen et al, 23 grew a hexagonal close-packed Ni nanocrystal on the surface of graphene by a one-step solution phase method, and a minimum reection loss (RL) of À17.8 dB occurred when the sample thickness was 5 mm.…”

Section: Introductionmentioning

confidence: 99%

One-step hydrothermal synthesis of Ni–Fe–P/graphene nanosheet composites with excellent electromagnetic wave absorption properties

Zhao

Wang

et al. 2019

RSC Adv.

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Preparation and evaluation of the microwave absorption properties of template-free graphene foam-supported Ni nanoparticles

Abstract: This study aims to explore superior microwave absorption properties using magnetic Ni nanoparticles to decorate a three-dimensional graphene foam.

Cited by 56 publications

References 56 publications

Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Application of Microwave in Hydrogen Production from Methane Dry Reforming: Comparison Between the Conventional and Microwave-Assisted Catalytic Reforming on Improving the Energy Efficiency

One-step hydrothermal synthesis of Ni–Fe–P/graphene nanosheet composites with excellent electromagnetic wave absorption properties

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