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Polymer‐derived Co2Si@SiC/C/SiOC/SiO2/Co3O4 nanoparticles: Microstructural evolution and enhanced EM absorbing properties
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-04-02 , DOI: 10.1111/jace.17141 Yongfeng Wu 1, 2 , Yunwang Zhong 1 , Yan Guan 3 , Chong Gu 1 , Guangyu Shao 1 , Benyang Shi 1 , Zhiming Su 1 , Binbin Xu 4 , Zhaoju Yu 1, 5 , Anhua Liu 1, 2, 5
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-04-02 , DOI: 10.1111/jace.17141 Yongfeng Wu 1, 2 , Yunwang Zhong 1 , Yan Guan 3 , Chong Gu 1 , Guangyu Shao 1 , Benyang Shi 1 , Zhiming Su 1 , Binbin Xu 4 , Zhaoju Yu 1, 5 , Anhua Liu 1, 2, 5
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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.
中文翻译：
聚合物衍生的Co2Si @ SiC / C / SiOC / SiO2 / Co3O4纳米颗粒：微观结构演变和增强的EM吸收性能
在这项工作中，采用聚合物衍生的陶瓷方法制备了多孔核壳结构的Co 2 Si @ SiC / C / SiOC / SiO 2 / Co 3 O 4纳米颗粒。详细研究了壳上介孔的原位形成，所得纳米颗粒的微观结构和相演化。所获得的纳米颗粒-石蜡复合材料具有极低的最小反射系数（RC min）-60.9 dB，在X波段为3.50 GHz，在整个频率范围（2.5至18 GHz）中为15.5 GHz，宽的有效吸收带宽。结果表明，由于以下原因，所有已报道的钴基纳米材料均具有出色的电磁波（EMW）吸收性能：（a）SiC / C / SiOC / SiO的独特核壳结构以及复杂的相组成2 /钴3 O 4在壳中，导致纳米颗粒中大量异质界面；（b）纳米粒子同时具有介电损耗和磁损耗；（c）壳中的中孔延长了EMW的传播路径，从而增加了EMW的吸收/反射比。得益于材料结构设计，所形成的核壳结构含钴陶瓷纳米颗粒对于在恶劣环境下应用的薄而高性能的EMW吸收材料具有巨大的潜力。
更新日期：2020-04-02
中文翻译：
聚合物衍生的Co2Si @ SiC / C / SiOC / SiO2 / Co3O4纳米颗粒：微观结构演变和增强的EM吸收性能
在这项工作中，采用聚合物衍生的陶瓷方法制备了多孔核壳结构的Co 2 Si @ SiC / C / SiOC / SiO 2 / Co 3 O 4纳米颗粒。详细研究了壳上介孔的原位形成，所得纳米颗粒的微观结构和相演化。所获得的纳米颗粒-石蜡复合材料具有极低的最小反射系数（RC min）-60.9 dB，在X波段为3.50 GHz，在整个频率范围（2.5至18 GHz）中为15.5 GHz，宽的有效吸收带宽。结果表明，由于以下原因，所有已报道的钴基纳米材料均具有出色的电磁波（EMW）吸收性能：（a）SiC / C / SiOC / SiO的独特核壳结构以及复杂的相组成2 /钴3 O 4在壳中，导致纳米颗粒中大量异质界面；（b）纳米粒子同时具有介电损耗和磁损耗；（c）壳中的中孔延长了EMW的传播路径，从而增加了EMW的吸收/反射比。得益于材料结构设计，所形成的核壳结构含钴陶瓷纳米颗粒对于在恶劣环境下应用的薄而高性能的EMW吸收材料具有巨大的潜力。
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