Nano-Fe₃O₄ deposited CaCu₃Ti₄O₁₂/poly(vinylidene fluoride) composites with enhanced dielectric properties

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• 作者：Changhai Zhang ; Qingguo Chi ; Lizhu Liu…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：3
• 页码：2502-2510
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

In this paper, calcium copper tianate (CCTO) ceramics were prepared by a sol–gel technology, then Fe₃O₄-deposited CCTO hybrid particles (CCTO@Fe₃O₄) and corresponding CCTO@Fe₃O₄/poly(vinylidene fluoride) (PVDF) composites were also prepared. Transmission electron microscope image shows that Fe₃O₄ nanoparticles with a certain degree of agglomeration deposited on the surface of CCTO powders. The high dielectric permittivity (115.8), low dielectric loss (0.48) and low conductivity (3.47 × 10−7 S/m) at 100 Hz were simultaneously achieved when the content of CCTO@Fe₃O₄ was 40 vol%. The electric modulus formalism indicated that the Fe₃O₄ nanoparticles could effectively enhance the interfacial polarization of the CCTO@Fe₃O₄/PVDF composites. Moreover, the structure of the CCTO@Fe₃O₄ particles effectively suppressed the formation of conducting path in PVDF matrix, resulting in a high dielectric permittivity, a low dielectric loss and a low conductivity of the composite. All the above-mentioned properties are beneficial for the use of these composites in the electronics industry, for applications such as printed circuit boards.