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.

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。