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Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture
Matter ( IF 17.3 ) Pub Date : 2020-03-17 , DOI: 10.1016/j.matt.2020.02.014
Abozar Akbari , Benjamin V. Cunning , Shalik R. Joshi , Chunhui Wang , Dulce C. Camacho-Mojica , Shahana Chatterjee , Vijayakumar Modepalli , Collin Cahoon , Christopher W. Bielawski , Pavel Bakharev , Gun-Ho Kim , Rodney S. Ruoff

We report a new approach to making highly dense, oriented, and crystalline graphite films from heat-treated and pressed graphene oxide (G-O). By introducing small-diameter reduced graphene oxide (rG-O) flakes into the graphene oxide starting material, we found that after heat treatment at 3,000°C, the sample density and atomic order substantially improved over a film composed, at the outset, only of pure G-O flakes. A subsequent mechanical press increased the density but reduced the atomic order. A second 3,000°C heat treatment restored the graphitic structure with graphitization metrics exceeding even those of the first heat treatment. The optimized graphitic film with an original concentration of 15 wt % reduced G-O in G-O gave well-oriented graphitic films with a density of 2.1 g cm−3, cross-plane thermal conductivity of 5.65 W m−1 K−1, and in-plane thermal conductivity of 2,025 ± 25 W m−1 K−1.



中文翻译:

氧化石墨烯/还原氧化石墨烯混合物的高阶致密导热石墨膜

我们报告了一种新方法,可以通过热处理和压制氧化石墨烯(GO)制成高密度,取向和结晶的石墨膜。通过将小直径还原氧化石墨烯(rG-O)薄片引入氧化石墨烯原料中,我们发现在3,000°C的温度下进行热处理后,样品密度和原子序数比起初仅由膜组成的薄膜有了实质性的改善纯GO片。随后的机械压力提高了密度,但降低了原子序。第二个3,000°C热处理恢复了石墨结构,其石墨化指标甚至超过了第一次热处理的石墨化指标。经过优化的石墨膜,其原始GO浓度降低了15 wt%,从而得到了密度为2.1 g cm -3的取向良好的石墨膜,横截面热导率为5.65 W m -1 K -1,平面内热导率为2,025±25 W m -1 K -1

更新日期:2020-03-17
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