Carbon-Encapsulated Fe Nanoparticles Embedded in Organic Polypyrrole Polymer as a High Performance Microwave Absorber

Jiang, Linwen; Wang, Zhenhua; Geng, D. Y.; Wang, Yu; An, Jing; He, Jun; Li, Da; Liu, Wei; Zhang, Zhidong

doi:10.1021/acs.jpcc.6b09445

Cited by 58 publications

(23 citation statements)

References 48 publications

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“…Jiang et al . designed carbon‐encapsulated Fe nanoparticles embedded in organic polypyrrole polymer as a high‐performance microwave absorber, whose reflection loss exceeding −10 dB is obtained in the 9.6–14.1 GHz for a given thickness of 2.5 mm . A broadband and lightweight microwave absorber constructed by in situ growth of hierarchical CoFe 2 O 4 /rGO porous nanocomposites was synthesized by Dong and coworkers, exhibited superior microwave absorption performance with an ultra‐broad bandwidth reaching 5.8 GHz (8.3–14.1 GHz) with a thin thickness of 2.8 mm and a strong reflection loss of −57.7 dB …”

Section: Introductionsupporting

confidence: 55%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

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In this study, a broadband, intense, novel, and promising microwave-absorbing nanocomposite was prepared using graphite-like carbon nitride (g-C 3 N 4 )/CuS suspended in poly(methyl methacrylate) (PMMA) medium. The g-C 3 N 4 nanosheets were synthesized by heating the urea as well as the CuS nanoparticles, and g-C 3 N 4 /CuS nanocomposites were prepared using a solvothermal method and then were separately molded by a PMMA solution to investigate their microwave-absorbing characteristics. The Fourier transform infrared and X-ray powder diffraction were used to characterize the g-C 3 N 4 , CuS, and CuS/g-C 3 N 4 nanostructures, which confirmed that the pure structure of the nanomaterials has been synthesized. The optical properties of the nanostructures were also investigated by diffuse reflection spectroscopy analysis. Accordingly, the Kubelka-Munk theory suggested significant narrow band gap for g-C 3 N 4 /CuS nanocomposite (0.27 eV), facilitating electron jumping and conductive loss. The morphology of the structures was examined using field emission scanning electron microscopy micrographs, illustrating that the uniform hexagonal structures of the CuS nanoplates have been formed and the CuS two-dimensional structures were uniformly distributed on the g-C 3 N 4 nanosheets. Finally, the microwave-absorbing properties of the CuS, g-C 3 N 4 , and g-C 3 N 4 /CuS were investigated by PMMA as a host. The microwaveabsorbing properties were evaluated using a vector network analyzer. The results illustrated that the maximum reflection loss of the g-C 3 N 4 /PMMA nanocomposite was −71.05 dB at 14.90 GHz with a thickness of 2.00 mm, demonstrating a 1.70 GHz bandwidth >30 dB, as well as g-C 3 N 4 /CuS/PMMA nanocomposite absorbed 7.30 GHz bandwidth of more than 10 dB with a thickness of 1.80 mm along the x-and ku-band frequency. The obtained results introduced the PMMA as a capable microwave-absorbing substrate. Besides, the g-C 3 N 4 /CuS/PMMA nanocomposite demonstrated metamaterial property and abundant attenuation constant.

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Section: Introductionsupporting

confidence: 55%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

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“…[8] Polypyrrole (PPy) is ap romising material for electrochemical energy conversion and storage. [10] SiO 2 ,o nt he other hand, has ag ood water affinity and easily cooperates with other materials. [10] SiO 2 ,o nt he other hand, has ag ood water affinity and easily cooperates with other materials.…”

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confidence: 99%

Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

et al. 2017

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Constructing inorganic-organic hybrids with superior properties in terms of water adsorption and activation will lead to catalysts with significantly enhanced electrocatalytic activity in the hydrogen evolution reaction (HER) in environmentally benign neutral media. Herein, we report SiO -polypyrrole (PPy) hybrid nanotubes supported on carbon fibers (CFs) (SiO /PPy NTs-CFs) as inexpensive and high-performance electrocatalysts for the HER in neutral media. Because of the strong electronic interactions between SiO and PPy, the SiO uniquely serves as the centers for water adsorption and activation, and accordingly promotes the HER. The metal-free SiO /PPy NTs-CFs displayed high catalytic activity in the HER in neutral media, such as a low onset potential and small Tafel slope, as well as excellent long-term durability.

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“…Polypyrrole (PPy) is a promising material for electrochemical energy conversion and storage . However, the surface of PPy is relatively hydrophobic and will impede water adsorption, leading to poor HER catalytic performance . SiO 2 , on the other hand, has a good water affinity and easily cooperates with other materials .…”

Section: Figurementioning

confidence: 99%

Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

Feng

et al. 2017

Angewandte Chemie

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Constructing inorganic-organic hybrids with superior properties in terms of water adsorption and activation will lead to catalysts with significantly enhanced electrocatalytic activity in the hydrogen evolution reaction (HER) in environmentally benign neutral media. Herein, we report SiO 2polypyrrole (PPy) hybrid nanotubes supported on carbon fibers (CFs) (SiO 2 /PPy NTs-CFs) as inexpensive and highperformance electrocatalysts for the HER in neutral media. Because of the strong electronic interactions between SiO 2 and PPy,t he SiO 2 uniquely serves as the centers for water adsorption and activation, and accordingly promotes the HER. The metal-free SiO 2 /PPy NTs-CFs displayed high catalytic activity in the HER in neutral media, such as al ow onset potential and small Tafel slope,aswell as excellent longterm durability.

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Carbon-Encapsulated Fe Nanoparticles Embedded in Organic Polypyrrole Polymer as a High Performance Microwave Absorber

Cited by 58 publications

References 48 publications

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

Silica–Polypyrrole Hybrids as High‐Performance Metal‐Free Electrocatalysts for the Hydrogen Evolution Reaction in Neutral Media

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