Enhanced dielectric permittivity of graphite oxide/polyimide composite films

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• 作者：Jun Li 李俊 ; Ya Wang 王亚 ; Heng-feng Li 李衡峰
• 关键词：graphite oxide ; pressurized oxidation ; polyimide ; dielectric permittivity ; percolation
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：23
• 期：11
• 页码：2747-2753
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：23

文摘

Graphite oxide (GO) was prepared by the pressurized oxidation method and incorporated into polyimide (PI) matrix to fabricate high-k composite films by in-situ polymerization and subsequent thermal treatment. The results show that the as-prepared GO had good dispersion and compatibility in PI matrix due to the introduction of abundant oxygen-containing functional groups during the oxidation. The residual graphitic domains and the thermal treatment induced reduction of GO further enhanced the dielectric permittivity of the resulting GO–PI composites. The dielectric permittivity of the GO–PI composites exhibited a typical percolation behavior with a percolation threshold of 0.0347 of volume ratio and a critical exponent of 0.837. Near the percolation threshold, the dielectric permittivity of the GO–PI composite increased to 108 at 102 Hz and was 26 times that of the pure PI.