Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

Luo, Zhongyi; Wang, Zhaohao; Liu, Jinshuai; Jin, Huihui; Han, Chunhua; Wang, Chongmin

doi:10.3390/ma16093380

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…These results demonstrate that the design of unique microstructures can significantly improve the microwave absorption performance . Among them, the hollow structure offers a large cavity, increasing the specific surface area and reducing the weight . This is beneficial for inducing multiple reflections, improving impedance matching, and enhancing the microwave absorption performance.…”

Section: Introductionmentioning

confidence: 99%

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

Han,

Zhang,

Qiao

et al. 2024

ACS Appl. Nano Mater.

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Metal−organic framework (MOF)-derived materials have gained popularity as microwave absorbing materials due to their electromagnetic dissipation advantages. In this study, a special type of MOF (ZIF-L) was used as a precursor; tannic acid was introduced for chemical etching. The resulting material obtained by in situ carbonization was a hollow structure of N-doped carbon embedded by Co nanoparticles (CoHNC), which retained the original pumpkin seed shape but had a hierarchical porous structure on the inside. By adjustment of the amount of cobalt nitrate and the carbonation temperature, the electromagnetic parameters could be altered, improving impedance matching and enabling different microwave absorption properties to be obtained. At 16.96 GHz, the material exhibits an optimal reflection loss of −45.5 dB, an effective bandwidth of 3.04 GHz, and a matching thickness of only 1.4 mm with a material filler of 30 wt %. The microwave loss mechanism is formed by the dual loss mechanism with dielectric loss as the main loss and magnetic loss as the auxiliary one. Therefore, the synthesis of the CoHNC composite through simple etching provides a useful idea for optimizing microwave absorbing materials.

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Section: Introductionmentioning

confidence: 99%

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

Han,

Zhang,

Qiao

et al. 2024

ACS Appl. Nano Mater.

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“…[5][6][7][8][9]. Therefore, the attractiveness of CNM-based composites is also at a high level [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ni-Cu-CNF Composite Materials via Carbon Erosion of Ni-Cu Bulk Alloys Prepared by Mechanochemical Alloying

et al. 2023

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The unique physical and chemical properties of composite materials based on carbon nanofibers (CNFs) makes them attractive to scientists and manufacturers. One promising method to produce CNFs is catalytic chemical vapor deposition (CCVD). In the present work, a method based on carbon erosion (CE) of bulk microdispersed Ni-Cu alloys has been proposed to prepare efficient catalysts for the synthesis of CNF-based composites. The initial Ni-Cu alloys were obtained by mechanochemical alloying (MCA) of metallic powders in a planetary mill. The effect of MCA duration on the phase composition of Ni-Cu samples was studied by X-ray diffraction analysis and temperature-programmed reduction in hydrogen. It has been also revealed that, during such stages as heating, reduction, and short-term exposure to the reaction mixture (C2H4/H2/Ar) at 550 °C, the formation of a Ni-based solid solution from the initial Ni-Cu alloys takes place. The early stages of the CE process were monitored by transmission electron microscopy combined with energy-dispersive X-Ray analysis. It was found that the composition of the catalytic particles is identical to that of the initial alloy. The morphological and structural features of the prepared Ni-Cu-CNF composites were studied by scanning and transmission electron microscopies. The textural characteristics of the composites were found to be dependent on the reaction time.

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Multidimensional nanomaterials synergistic polyimide nanofiber/MXene/NiFe2O4 hybrid aerogel for high-performance microwave absorption

Wang

Qian

et al. 2023

Chemical Engineering Journal

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Hierarchical Carbon Network Composites Derived from ZIF-8 for High-Efficiency Microwave Absorption

Cited by 5 publications

References 49 publications

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

Synthesis of Ni-Cu-CNF Composite Materials via Carbon Erosion of Ni-Cu Bulk Alloys Prepared by Mechanochemical Alloying

Multidimensional nanomaterials synergistic polyimide nanofiber/MXene/NiFe2O4 hybrid aerogel for high-performance microwave absorption

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