†Program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering and ‡School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea.
ACS Appl Mater Interfaces. 2015 May 13;7(18):9668-81. doi: 10.1021/acsami.5b01430. Epub 2015 May 4.
This work describes a ternary nanocomposite system, composed of poly(vinylidene fluoride) (PVDF), NH2-treated graphene nanodots (GNDs), and reduced graphene oxides (RGOs), for use in high energy density capacitor. When the RGO sheets were added to PVDF matrix, the β-phase content of PVDF became higher than that of the pristine PVDF. The surface-treatment of GNDs with an ethylenediamine can promote the hydrogen bonding interactions between the GNDs and PVDF, which promote the formation of β-phase PVDF. This finding could be extended to combine the advantages of both RGO and NH2-treated GND for developing an effective and reliable means of preparing PVDF/NH2-treated GND/RGO nanocomposite. Relatively small amounts of NH2-treated GND/RGO cofillers (10 vol %) could make a great impact on the α → β phase transformation, dielectric, and ferroelectric properties of the ternary nanocomposite. The resulting PVDF/NH2-treated GND/RGO nanocomposite exhibited higher dielectric constant (ε' ≈ 60.6) and larger energy density (U(e) ≈ 14.1 J cm(-3)) compared with the pristine PVDF (ε' ≈ 11.6 and U(e) ≈ 1.8 J cm(-3)).
这项工作描述了一种三元纳米复合体系，由聚偏二氟乙烯 (PVDF)、NH2 处理的石墨烯纳米点 (GNDs) 和还原氧化石墨烯 (RGOs) 组成，用于高能量密度电容器。当 RGO 片添加到 PVDF 基体中时，PVDF 的β相含量高于原始 PVDF。GNDs 用乙二胺进行表面处理可以促进 GNDs 和 PVDF 之间的氢键相互作用，从而促进β相 PVDF 的形成。这一发现可以扩展到结合 RGO 和 NH2 处理的 GND 的优点，为开发有效和可靠的制备 PVDF/NH2 处理的 GND/RGO 纳米复合材料的方法提供思路。相对少量的 NH2 处理的 GND/RGO 共填料（10 体积%）可以极大地影响三元纳米复合材料的α→β 相转变、介电和铁电性能。与原始 PVDF（ε'≈11.6 和 U(e)≈1.8 J cm(-3)）相比，所得的 PVDF/NH2 处理的 GND/RGO 纳米复合材料表现出更高的介电常数（ε'≈60.6）和更大的能量密度（U(e)≈14.1 J cm(-3)）。
