Infrared heating mediated synthesis and characterization of FeCo/C nanocomposites

Karpenkov, D.; Муратов, Д. Г.; Kozitov, L. V.; Skokov, Konstantin P.; Karpenkov, A. Yu.; Попкова, А. В.; Gutfleisch, Oliver

doi:10.1016/j.jmmm.2017.01.008

Cited by 12 publications

(3 citation statements)

References 38 publications

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“…The effects of deposition temperature on the molar ratios of Fe/Co the nanocores and the graphitization degree of C shells can be understood in the following two aspects. First, at temperatures below 800 °C, gaseous Co(acac) 3 exhibits a higher decomposition ratio than Fe(acac) 3 during the MOCVD process, according to our previous studies [6,49] and other reported results [56,57]. It is therefore expected that the ratio of Fe in the alloy NP should be lower than that of Co at relatively low temperature (700 °C), and then increase with the increasing temperature (800 °C), and finally approaches the ratio value in the gaseous precursor at high temperature (900 °C) [56,57].…”

Section: Resultssupporting

confidence: 57%

“…First, at temperatures below 800 °C, gaseous Co(acac) 3 exhibits a higher decomposition ratio than Fe(acac) 3 during the MOCVD process, according to our previous studies [6,49] and other reported results [56,57]. It is therefore expected that the ratio of Fe in the alloy NP should be lower than that of Co at relatively low temperature (700 °C), and then increase with the increasing temperature (800 °C), and finally approaches the ratio value in the gaseous precursor at high temperature (900 °C) [56,57]. Second, the C shells are formed by the precipitation of C atom from the FeCo-C nanoagglomerates.…”

Section: Resultssupporting

confidence: 57%

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Facile synthesis and excellent microwave absorption properties of FeCo-C core–shell nanoparticles

et al. 2018

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FeCo-C core-shell nanoparticles (NPs) with diameters of 10-50 nm have been fabricated on a large scale by one-step metal-organic chemical vapor deposition using the mixture of cobalt acetylacetonate and iron acetylacetonate as the precursor. The Fe/Co molar ratio of the alloy nanocores and graphitization degree of C shells, and thus the magnetic and electric properties of the core-shell NPs, can be tuned by the deposition temperature ranging from 700 °C to 900 °C. Comparative tests reveal that a relatively high Fe/Co molar ratio and low graphitization degree benefit the microwave absorption (MA) performance of the core-shell NPs. The composite with 20 wt% core-shell NP obtained at 800 °C and 80 wt% paraffin exhibits an optimal reflection loss [Formula: see text] of -60.4 dB at 7.5 GHz with a thickness of 3.3 mm, and an effective absorption bandwidth (frequency range for RL ≤10 dB) of 9.2 GHz (8.8-18.0 GHz) under an absorber thickness of 2.5 mm. Our study provides a facile route for the fabrication of alloy-C core-shell nanostructures with high MA performance.

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Section: Resultssupporting

confidence: 57%

Section: Resultssupporting

confidence: 57%

Facile synthesis and excellent microwave absorption properties of FeCo-C core–shell nanoparticles

et al. 2018

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“…In our research, we developed methods and technology for the synthesis of nanocomposites based on pyrolyzed polyacrylonitrile, containing nanoparticles of various alloys of transition metals in the iron group (Fe-Ni, Fe-Co, Ni-Co) [34][35][36]. It is possible to apply these materials to a wide range of industries: petrochemical synthesis, catalysis, materials of supercapacitor electrodes, gas sensors and electromagnetic radiation insulation, and radio-absorbing materials for microwave electronics devices (provide absorption of microwave radiation up to 80% in the bandwidth of 3-12 GHz and up to 98.7% in the bandwidth of .…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites Based on Pyrolyzed Polyacrylonitrile Doped with FeCoCr/C Transition Metal Alloy Nanoparticles: Synthesis, Structure, and Electromagnetic Properties

Zaporotskova,

Muratov,

Kozhitov

et al. 2023

Polymers

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In the last decade, the development of new materials that absorb electromagnetic radiation (EMR) has received research interest as they can significantly enhance the performance of electronic devices and prevent adverse effects caused by electromagnetic pollution. Electromagnetic radiation absorbers with a low weight and small thickness of the absorber layer, good absorption capacity, and a wide frequency response bandwidth are highly demanded. Here, for the first time, the properties of polymer nanocomposites FeCoCr/C synthesized by doping FeCoCr alloy nanoparticles into a polymer matrix of pyrolyzed polyacrylonitrile are investigated. An analysis of the magnetic properties of FeCoCr/C nanocomposites showed that increasing the synthesis temperature increased the specific magnetization and coercive force values of the FeCoCr/C nanocomposites. The dependence between the ratio of metals in the precursor of pyrolyzed polyacrylonitrile and the electromagnetic and wave-absorbing properties of FeCoCr/C nanocomposites is considered, and the results of complex dielectric and magnetic permeability measurements are analyzed. It is found that the most promising of all the studied materials are those obtained at T = 700 °C with the ratio of metals Fe:Co:Cr = 35:35:30.

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Synthesis and Magnetic Properties of Fe–Co–Ni/С Nanocomposites

et al. 2018

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Infrared heating mediated synthesis and characterization of FeCo/C nanocomposites

Cited by 12 publications

References 38 publications

Facile synthesis and excellent microwave absorption properties of FeCo-C core–shell nanoparticles

Facile synthesis and excellent microwave absorption properties of FeCo-C core–shell nanoparticles

Nanocomposites Based on Pyrolyzed Polyacrylonitrile Doped with FeCoCr/C Transition Metal Alloy Nanoparticles: Synthesis, Structure, and Electromagnetic Properties

Synthesis and Magnetic Properties of Fe–Co–Ni/С Nanocomposites

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