Graphite foil (GF) is widely used as a sealing material in different industries. Different methods of GF preparation result in differences of its crystalline and pore structure, which in turn influences its ability to pass through gases and provide the required level of sealability. The influence of the preparation temperature of exfoliated graphite (EG) on the microstructure and gas permeability of EG-based graphite foil was investigated. The preparation of graphite foil consisted of the synthesis of stage-1 graphite bisulfate, followed by washing with water, rapid heating of obtained expandable graphite at temperatures of 600, 800, 1000 °C with the formation of exfoliated graphite and the subsequent compression of EG into graphite foil. The structure of the materials was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The correlation between EG preparation conditions, the presence of amorphous and turbostratic carbon, which influence the GF porous structure and GF gas permeance, was found. Graphite foil based on EG obtained at 600 °C had the minimal nitrogen and hydrogen permeances of 0.11·10–10 and 0.44·10–10 mol m−2 s−1 Pa−1, while the increase in EG preparation temperature up to 1000 °C raises GF gas permeance.

中文翻译：

---

不同微观结构薄片石墨制备石墨箔的透气性

石墨箔（GF）被广泛用作不同行业的密封材料。GF 的不同制备方法导致其结晶和孔结构的差异，进而影响其通过气体和提供所需水平的密封性的能力。研究了薄片化石墨(EG)制备温度对EG基石墨箔微观结构和透气性的影响。石墨箔的制备包括第一阶段石墨硫酸氢盐的合成，然后用水洗涤，在600、800、1000°C的温度下快速加热得到的可膨胀石墨，形成薄片化石墨，然后压缩EG成石墨箔。通过扫描电子显微镜对材料的结构进行表征，透射电子显微镜、X 射线衍射和拉曼光谱。发现了 EG 制备条件、影响 GF 多孔结构和 GF 气体渗透性的无定形和乱层碳的存在之间的相关性。在 600 °C 下获得的基于 EG 的石墨箔具有 0.11·10-10 和 0.44·10-10 mol m-2 s-1 Pa-1 的最小氮和氢渗透率，而 EG 制备温度升高至 1000 °C 会提高 GF 气体渗透率。