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Size-Dependent Liquid Crystal Behavior of Graphene Oxides for Preparation of Highly Ordered Graphene-Based Films
Applied Sciences ( IF 2.838 ) Pub Date : 2020-08-12 , DOI: 10.3390/app10165570
Bongjin Chung , Sunghwan Jin , Junyoung Jeong , Giyoung Jeon , Seongwoo Ryu

We report the preparation of a highly-oriented graphene-based film prepared from liquid crystal dispersion of graphene oxides (GOs). We observed that the liquid crystal behavior of GOs is highly affected by the lateral size of GO flakes: the critical concentration for liquid crystal formation decreased with the increase of the lateral size of GO flakes, which is in a good agreement with Onsager’s theory. As a result, we were able to obtain highly-ordered graphene assemblies with large-sized GO flakes (150 ± 29 μm) at relatively low concentrations. By applying the shear force, we were able to obtain highly-oriented films from liquid crystal GO flakes. After hydrogen iodide (HI) reduction, GO films showed excellent mechanical strength and electrical conductivity, which were 278% and 283% higher, respectively, than those of films made from smaller sized GO flakes (28 ± 24 μm).

中文翻译:

用于制备高度有序石墨烯基薄膜的氧化石墨烯的尺寸依赖性液晶行为

我们报告了由氧化石墨烯 (GO) 的液晶分散体制备的高度取向的石墨烯基薄膜的制备。我们观察到 GO 的液晶行为受 GO 薄片横向尺寸的影响很大:液晶形成的临界浓度随着 GO 薄片横向尺寸的增加而降低,这与 Onsager 的理论非常吻合。结果,我们能够以相对较低的浓度获得具有大尺寸 GO 薄片(150 ± 29 μm)的高度有序的石墨烯组件。通过施加剪切力,我们能够从液晶 GO 薄片中获得高度取向的薄膜。碘化氢 (HI) 还原后,GO 薄膜表现出优异的机械强度和导电性,分别提高了 278% 和 283%,
更新日期:2020-08-12
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