Polymer‐derived Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles: Microstructural evolution and enhanced EM absorbing properties
In this work, porous core‐shell structured Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles were fabricated by a polymer‐derived ceramic approach. The in situ formation of mesopores on the shell, microstructural, and phase evolution of resulting nanoparticles were investigated in detail. The obtained nanop...
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Published in | Journal of the American Ceramic Society Vol. 103; no. 12; pp. 6764 - 6779 |
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Abstract | In this work, porous core‐shell structured Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles were fabricated by a polymer‐derived ceramic approach. The in situ formation of mesopores on the shell, microstructural, and phase evolution of resulting nanoparticles were investigated in detail. The obtained nanoparticles‐paraffin composites possess a very low minimum reflection coefficient (RCmin) −60.9 dB, broad effective absorption bandwidth 3.50 GHz in the X‐band and 15.5 GHz in the whole frequency range (from 2.5 to 18 GHz). The results indicate outstanding electromagnetic wave (EMW) absorbing performance among all the reported cobalt‐based nanomaterials, due to the reasons as follows: (a) The unique core‐shell structure as well as complex phase composition of SiC/C/SiOC/SiO2/Co3O4 in the shell, result in a large number of heterogeneous interfaces in the nanoparticles; (b) Nanoparticles have both dielectric and magnetic loss; (c) Mesopores in the shell prolong the propagation path of EMW, thereby increasing the absorption/reflection ratio of EMWs. Thanks to the material structure design, the resulting core‐shell structured cobalt‐containing ceramic nanoparticles have great potential for thin and high‐performance EMW absorbing materials applied in harsh environment.
Porous core‐shell structured cobalt‐containing ceramic nanoparticles: in‐situ formation of mesopores, microstructural evolution and enhanced EM absorbing properties. |
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AbstractList | In this work, porous core‐shell structured Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles were fabricated by a polymer‐derived ceramic approach. The in situ formation of mesopores on the shell, microstructural, and phase evolution of resulting nanoparticles were investigated in detail. The obtained nanoparticles‐paraffin composites possess a very low minimum reflection coefficient (RCmin) −60.9 dB, broad effective absorption bandwidth 3.50 GHz in the X‐band and 15.5 GHz in the whole frequency range (from 2.5 to 18 GHz). The results indicate outstanding electromagnetic wave (EMW) absorbing performance among all the reported cobalt‐based nanomaterials, due to the reasons as follows: (a) The unique core‐shell structure as well as complex phase composition of SiC/C/SiOC/SiO2/Co3O4 in the shell, result in a large number of heterogeneous interfaces in the nanoparticles; (b) Nanoparticles have both dielectric and magnetic loss; (c) Mesopores in the shell prolong the propagation path of EMW, thereby increasing the absorption/reflection ratio of EMWs. Thanks to the material structure design, the resulting core‐shell structured cobalt‐containing ceramic nanoparticles have great potential for thin and high‐performance EMW absorbing materials applied in harsh environment. In this work, porous core‐shell structured Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles were fabricated by a polymer‐derived ceramic approach. The in situ formation of mesopores on the shell, microstructural, and phase evolution of resulting nanoparticles were investigated in detail. The obtained nanoparticles‐paraffin composites possess a very low minimum reflection coefficient (RCmin) −60.9 dB, broad effective absorption bandwidth 3.50 GHz in the X‐band and 15.5 GHz in the whole frequency range (from 2.5 to 18 GHz). The results indicate outstanding electromagnetic wave (EMW) absorbing performance among all the reported cobalt‐based nanomaterials, due to the reasons as follows: (a) The unique core‐shell structure as well as complex phase composition of SiC/C/SiOC/SiO2/Co3O4 in the shell, result in a large number of heterogeneous interfaces in the nanoparticles; (b) Nanoparticles have both dielectric and magnetic loss; (c) Mesopores in the shell prolong the propagation path of EMW, thereby increasing the absorption/reflection ratio of EMWs. Thanks to the material structure design, the resulting core‐shell structured cobalt‐containing ceramic nanoparticles have great potential for thin and high‐performance EMW absorbing materials applied in harsh environment. Porous core‐shell structured cobalt‐containing ceramic nanoparticles: in‐situ formation of mesopores, microstructural evolution and enhanced EM absorbing properties. |
Author | Shi, Benyang Yu, Zhaoju Gu, Chong Guan, Yan Liu, Anhua Wu, Yongfeng Su, Zhiming Xu, Binbin Shao, Guangyu Zhong, Yunwang |
Author_xml | – sequence: 1 givenname: Yongfeng surname: Wu fullname: Wu, Yongfeng organization: Shenzhen Research Institute of Xiamen University – sequence: 2 givenname: Yunwang surname: Zhong fullname: Zhong, Yunwang organization: Xiamen University – sequence: 3 givenname: Yan surname: Guan fullname: Guan, Yan organization: Peking University – sequence: 4 givenname: Chong surname: Gu fullname: Gu, Chong organization: Xiamen University – sequence: 5 givenname: Guangyu surname: Shao fullname: Shao, Guangyu organization: Xiamen University – sequence: 6 givenname: Benyang surname: Shi fullname: Shi, Benyang organization: Xiamen University – sequence: 7 givenname: Zhiming surname: Su fullname: Su, Zhiming organization: Xiamen University – sequence: 8 givenname: Binbin surname: Xu fullname: Xu, Binbin organization: Xiamen University – sequence: 9 givenname: Zhaoju orcidid: 0000-0003-0970-957X surname: Yu fullname: Yu, Zhaoju email: zhaojuyu@xmu.edu.cn organization: Xiamen University – sequence: 10 givenname: Anhua orcidid: 0000-0002-5651-4321 surname: Liu fullname: Liu, Anhua email: ahliu@xmu.edu.cn organization: Xiamen University |
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Snippet | In this work, porous core‐shell structured Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles were fabricated by a polymer‐derived ceramic approach. The in situ... |
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SubjectTerms | Absorption Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles Cobalt oxides Electromagnetic radiation electromagnetic wave absorbing properties Evolution Frequency ranges microstructural evolution Nanomaterials Nanoparticles Paraffins Phase composition Polymers polymer‐derived ceramics porous core‐shell structure Reflectance Reflection Shells Shells (structural forms) Silicon carbide Silicon dioxide |
Title | Polymer‐derived Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles: Microstructural evolution and enhanced EM absorbing properties |
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