Preparation and Dielectric Characteristics of Semitransparent CoFe2O4–P(VDF-TrFE) Nanocomposite Films

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• 作者：Wen Dong (1)
  Yiping Guo (1)
  Yun Liu (1)
  Hezhou Liu (1)
  Hua Li (1)
  
• 关键词：CoFe2O4 nanoparticles ; polymer–ceramic nanocomposite ; spin coating ; assisted dispersion ; dielectric properties
• 刊名：Journal of Electronic Materials
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：42
• 期：4
• 页码：734-738
• 全文大小：400KB
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• 作者单位：Wen Dong (1)
  Yiping Guo (1)
  Yun Liu (1)
  Hezhou Liu (1)
  Hua Li (1)
  
  1. State Key Laboratory of MMCs, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China
  
• ISSN：1543-186X

文摘

Polymer–ceramic nanocomposites play an important role in embedded capacitors. However, polymer–ceramic dielectrics are limited for commercial applications due to their low transmittance, poor adhesion, and poor thermal stress reliability at high filler loadings. Thus, materials design and processing is critical to prepare films with improved dielectric properties and low filler loading. In this work, we use a spin coating-assisted method to fabricate poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)]–CoFe2O4 (CFO) nanocomposite films. Magnetic CFO nanoparticles in the size range of 10?nm to 40?nm were successfully synthesized using a hydrothermal process. The dispersion of the nanoparticles, the dielectric properties, and the transmittance of the nanocomposite films were studied. The dielectric constant of the nanocomposite films increased by about 45% over the frequency range of 100?Hz to 1?MHz, compared with that of pristine P(VDF-TrFE) film. Optical measurements indicated that the transmittance of the films remains above 60% in the visible range, indicating a relatively low content of CFO in the polymer matrix. Our experimental results suggest that spin coating-assisted dispersion may be a promising route to fabricate dielectric polymer–ceramic nanocomposite films of controllable thickness.