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首页> 美国卫生研究院文献>Nanoscale Research Letters >Low percolation threshold of graphene/polymer composites prepared by solvothermal reduction of graphene oxide in the polymer solution
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Low percolation threshold of graphene/polymer composites prepared by solvothermal reduction of graphene oxide in the polymer solution

机译：通过溶剂热还原聚合物溶液中的氧化石墨烯制备的石墨烯/聚合物复合材料的低渗透阈值

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摘要

Graphene/polyvinylidene fluoride (PVDF) composites were prepared using in-situ solvothermal reduction of graphene oxide in the PVDF solution. The electrical conductivity of the composites was greatly improved by doping with graphene sheets. The percolation threshold of such composite was determined to be 0.31 vol.%, being much smaller than that of the composites prepared via blending reduced graphene sheets with polymer matrix. This is attributed to the large aspect ratio of the SRG sheets and their uniform dispersion in the polymer matrix. The dielectric constant of PVDF showed a marked increase from 7 to about 105 with only 0.5 vol.% loading of SRG content. Like the other conductor-insulator systems, the AC conductivity of the system also obeyed the universal dynamic response. In addition, the SRG/PVDF composite shows a much stronger nonlinear conduction behavior than carbon nanotubeanofiber based polymer composite, owing to intense Zener tunneling between the SRG sheets. The strong electrical nonlinearity provides further support for a homogeneous dispersion of SRG sheets in the polymer matrix.
机译：石墨烯/聚偏二氟乙烯（PVDF）复合材料是通过在PVDF溶液中原位溶剂热还原氧化石墨烯制备的。通过掺杂石墨烯片极大地提高了复合材料的电导率。确定这种复合物的渗透阈值为0.31vol。％，比通过将还原的石墨烯片与聚合物基质共混而制备的复合物的渗透阈值小得多。这归因于SRG片材的高长宽比及其在聚合物基质中的均匀分散。 PVDF的介电常数显示出显着的增加，从7增加到约105，而SRG含量仅为0.5体积％。像其他导体绝缘系统一样，该系统的交流电导率也服从通用动态响应。此外，由于SRG片材之间强烈的齐纳隧穿，SRG / PVDF复合材料表现出比碳纳米管/纳米纤维基聚合物复合材料强得多的非线性传导行为。强大的电非线性为SRG片材在聚合物基质中的均匀分散提供了进一步的支持。

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