Largely enhanced dielectric properties of TiO2-nanorods/poly(vinylidene fluoride) nanocomposites driven by enhanced interfacial areas

IF 4.2 3区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES
Pornsawan Kum-onsa, N. Chanlek, P. Thongbai
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引用次数: 15

Abstract

Abstract In this work, nanocomposites consisting of TiO2-nanorods (TiO2-NRs) with less than 100 nm in size and poly(vinylidene fluoride) (PVDF) were prepared using a liquid-phase assisted dispersion and hot-pressing methods. At 1 kHz and 25 °C, the high dielectric permittivity of ∼66 and loss tangent of ∼0.03 can be obtained in the nanocomposite with a filler volume fraction of 0.5, which was higher than that of a neat PVDF matrix by a factor of 6. Dielectric permittivity of TiO2-NRs/PVDF nanocomposites not only highly increased with TiO2-NRs, but also almost independent of the frequency range of 102–106 Hz. The significant enhancement in dielectric permittivity is mainly attributed to the interfacial polarization at the interfaces of TiO2-NRs and PVDF, and semiconducting properties of TiO2-NRs. Among the various models used for rationalizing the dielectric behavior, the experimental dielectric data is in close agreement with EMT (n = 0.11) and Yamada models (n = 8). Graphical Abstract
界面面积的增加大大增强了tio2纳米棒/聚偏氟乙烯纳米复合材料的介电性能
摘要采用液相辅助分散和热压法制备了尺寸小于100 nm的tio2纳米棒(TiO2-NRs)和聚偏氟乙烯(PVDF)组成的纳米复合材料。在1 kHz和25°C下,填料体积分数为0.5的纳米复合材料的介电常数为~ 66,损耗正切为~ 0.03,比纯PVDF基体高6倍。TiO2-NRs/PVDF纳米复合材料的介电常数不仅随TiO2-NRs的增加而大幅增加,而且几乎与102-106 Hz的频率范围无关。介质介电常数的显著提高主要是由于TiO2-NRs与PVDF界面处的界面极化以及TiO2-NRs的半导体特性。在各种用于合理化介电行为的模型中,实验介电数据与EMT模型(n = 0.11)和Yamada模型(n = 8)非常吻合。图形抽象
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来源期刊
Nanocomposites
Nanocomposites Multiple-
CiteScore
7.40
自引率
15.20%
发文量
18
审稿时长
16 weeks
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