Composites with aligned and plasma-surface-modified graphene nanoplatelets and high dielectric constants

IF 2.2 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters: X Pub Date : 2024-04-10 DOI:10.1016/j.mlblux.2024.100233

Kaito Nagayama , Taku Goto , Koichi Mayumi , Rina Maeda , Tsuyohito Ito , Yoshiki Shimizu , Kohzo Ito , Yukiya Hakuta , Kazuo Terashima

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Abstract

We have developed a method for designing polymer and graphene nanoplatelet (GNP) composites that show high dielectric constants over a wide range of GNP contents. GNPs are dispersed in the composites through plasma-surface modification and aligned by applying an electric field (EF). This creates a large number of microcapacitor structures of GNPs separated by the polymer. The maximum dielectric constant of the sample to which the EF is applied is approximately twice that of the sample to which the EF is not applied. Furthermore, the maximum dielectric constants of the samples with plasma-surface modified GNPs are higher than those of the samples with unmodified GNPs. The composites show high dielectric constants (∼500 at 100 Hz) over a wide range of GNP contents (6 ∼ 10 wt%) while maintaining mechanical flexibility (Young’s modulus:12 ± 4 MPa).

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具有对齐和等离子体表面改性石墨烯纳米片和高介电常数的复合材料

我们开发了一种设计聚合物和石墨烯纳米板（GNP）复合材料的方法，这种复合材料在很宽的 GNP 含量范围内都能显示出很高的介电常数。通过等离子体表面改性将 GNP 分散在复合材料中，并通过施加电场 (EF) 使其对齐。这样就形成了大量由聚合物分隔的 GNP 微电容结构。施加电场的样品的最大介电常数大约是未施加电场的样品的两倍。此外，经过等离子体表面修饰的 GNPs 样品的最大介电常数高于未经修饰的 GNPs 样品。在较宽的 GNP 含量范围内（6 ∼ 10 wt%），复合材料都能显示出较高的介电常数（100 Hz 时介电常数为 500），同时还能保持机械柔韧性（杨氏模量：12 ± 4 MPa）。

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