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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Functionalized graphene-BaTiO3/ferroelectric polymer nanodielectric composites with high permittivity, low dielectric loss, and low percolation threshold
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Functionalized graphene-BaTiO3/ferroelectric polymer nanodielectric composites with high permittivity, low dielectric loss, and low percolation threshold

机译：高介电常数，低介电损耗和低渗透阈值的功能化石墨烯-BaTiO3 /铁电聚合物纳米介电复合材料

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摘要

The fabrication and dielectric properties of a novel multi-component high-k composite system consisting of poly(vinylidene fluoride), surface-functionalized graphene nanosheets and BT nanoparticles (fRGO-BT/ PVDF) were investigated. The fRGO nanosheets were prepared through the π-π stacking of polyaniline and GO following in situ hydrazine reduction. The fRGO-BT/PVDF nanocomposites were fabricated by a solution casting and hot-pressing approach. SEM results confirm that fRGO and BT are well dispersed within the PVDF matrix. The dielectric properties of the binary fRGO/PVDF nanocomposites exhibit a typical percolation transition with the percolation threshold of 1.49 vol%. This type of nanocomposite, co-filled with conductive graphene nanosheets and high-k ceramics, shows a high k_r (65) and a relatively low dielectric loss (tan 6 = 0.35) at a high frequency of 1 MHz. Meanwhile, the dielectric properties of the fRGO-BT/PVDF nanocomposites show temperature independent behavior over a wide temperature range. These flexible, high-k fRGO-BT/PVDF nanocomposites are potential flexible dielectric materials for use in high-frequency capacitors and electronic devices.
机译：研究了由聚偏二氟乙烯，表面官能化的石墨烯纳米片和BT纳米颗粒（fRGO-BT / PVDF）组成的新型多组分高k复合体系的制备和介电性能。通过原位肼还原后聚苯胺和GO的π-π堆叠制备fRGO纳米片。 fRGO-BT / PVDF纳米复合材料是通过溶液浇铸和热压方法制备的。 SEM结果证实fRGO和BT很好地分散在PVDF基质中。二元fRGO / PVDF纳米复合材料的介电性能表现出典型的渗滤转变，其渗滤阈值为1.49 vol％。与导电石墨烯纳米片和高k陶瓷共同填充的这种纳米复合材料在1 MHz的高频下显示出高k_r（65）和相对低的介电损耗（tan 6 = 0.35）。同时，fRGO-BT / PVDF纳米复合材料的介电性能在很宽的温度范围内显示出与温度无关的行为。这些柔性，高k fRGO-BT / PVDF纳米复合材料是潜在的柔性介电材料，可用于高频电容器和电子设备。

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