Synergistic enhancement of dielectric properties of polymer matrix composites by micro-nano bicomponent ceramics and conductive particles

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-02-23 DOI:10.1049/nde2.12039
Dongyi Wu, Yue Zhai, Haiping Xu, Lihe Guo
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引用次数: 3

Abstract

Barium titanate (BaTiO3, BT) was co-doped by solid-state sintering with niobium pentoxide (Nb2O5) and cobalt trioxide (Co3O4) as dopants. The modified barium titanate containing Nb and Co (BTNC) with larger particle size (0.5–1 μm) and silver powder (Ag) with smaller particle size (25 nm) were co-filled with polyvinylidene fluoride (PVDF) to prepare (BTNC-Ag)/PVDF three-phase composites. The morphology and crystal structure of composites were characterised by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. SEM shows that when the volume ratio of BTNC and Ag in the composite is 4:1, the two fillers have good dispersion in polymer matrix and could intersperse with each other to reduce voids. XRD patterns display that the filling of BTNC and Ag powders was conducive to promoting the enhancement of the diffraction peaks of β phase and γ phase in PVDF. The dielectric properties of the composites are effectively enhanced through the synergistic effect of the micro-nano bicomponent ceramic BTNC and conductive particles Ag co-filled polymer PVDF. When the volume ratio of filler (BTNC:Ag = 4:1) to matrix PVDF is 2/1, the dielectric properties of the composite are the best, the dielectric constant reaches 134.1 at 102 Hz and the dielectric loss is 0.04.

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微纳双组分陶瓷和导电颗粒协同增强聚合物基复合材料介电性能
采用固相烧结的方法,以五氧化铌(Nb2O5)和三氧化钴(Co3O4)为掺杂剂共掺杂钛酸钡(BaTiO3, BT)。将粒径较大(0.5-1 μm)的含Nb和Co的改性钛酸钡(BTNC)和粒径较小(25 nm)的银粉(Ag)与聚偏氟乙烯(PVDF)共填充,制备了(BTNC-Ag)/PVDF三相复合材料。利用扫描电镜(SEM)和x射线衍射仪(XRD)对复合材料的形貌和晶体结构进行了表征。SEM结果表明,当复合材料中BTNC和Ag的体积比为4:1时,两种填料在聚合物基体中分散性良好,可以相互穿插,减少空隙。XRD谱图表明,BTNC和Ag粉末的填充有利于促进PVDF中β相和γ相衍射峰的增强。通过微纳双组分陶瓷BTNC与导电颗粒Ag共填充聚合物PVDF的协同作用,有效增强了复合材料的介电性能。当填料(BTNC:Ag = 4:1)与基体PVDF的体积比为2/1时,复合材料的介电性能最佳,在102 Hz时介电常数达到134.1,介电损耗为0.04。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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