Fabrication of core-shell structured Ni@BaTiO3 scaffolds for polymer composites with ultrahigh dielectric constant and low loss
Fabrication of core-shell structured Ni@BaTiO3 scaffolds for polymer composites with ultrahigh dielectric constant and low loss
复制标题
超高介电常数和低损耗聚合物复合材料核壳结构Ni@BaTiO3支架的制备
DOI:
10.1016/j.compositesa.2019.105521
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发表时间:
2019-10
期刊:
影响因子:
--
通讯作者:
Shi Zhicheng
中科院分区:
文献类型:
--
作者:
Zhu Xiaotong;Yang Jie;Dastan Davoud;Garmestani Hamid;Fan Runhua;Shi Zhicheng
Dielectric composites have drawn increasing attention owing to their wide applications in electrical systems. Herein, a novel design of dielectric composites consisting of core-shell structured porous Ni@BaTiO3scaffolds infiltrated with epoxy was developed. It is demonstrated that the dielectric constants of the composites could be as high as 6397@10 kHz, which is approximately 1777 times higher than pure epoxy matrix (εr≈ 3.6@10 kHz). Meanwhile, the dielectric loss (tanδ≈ 0.04@10 kHz) remains comparable to that of pure epoxy (tanδ≈ 0.01@10 kHz). It is believed that the strong charge accumulation and interfacial polarizations on the huge interfaces, especially the Ni/BaTiO3and Ni/epoxy interfaces, give arise to the substantially enhancedεr. Besides, the sintered insulating BaTiO3coating can block the transportation of charge carriers, resulting in the low loss. The ultrahigh dielectric constants and low loss make these composites promising candidates for microstrip antennas, field-effect transistors and dielectric capacitors.
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DOI:
10.1002/advs.201700512
发表时间:
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期刊:
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
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