膨胀石墨具有许多优良性质，如耐高温、导热性优异、化学稳定性和导电性良好、自润滑性、密度小、柔性好、疏松多孔、可压缩回弹等，因此在隔热、隔音、灭火材料、极端环境下的润滑材料和密封材料、电极材料、超低硫高纯核能级柔性石墨材料等领域有广泛的应用。然而，目前膨胀石墨主要是通过化学氧化法制备，制备过程中需应用氧化剂和插层剂，会在膨胀石墨中残留有杂质原子和分子，并且会对其化学键造成破坏，从而危害其性能。该项目研究利用等离子体反应的特点，将膨胀石墨置于含碳气体如甲烷的等离子体氛围中，在500℃左右的相对较低温度下，可以在原子和分子层面上，在不损害膨胀石墨的sp2杂化C-C键的条件下，将膨胀石墨中的杂质通过等离子体氛围中的化学反应而刻蚀掉，同时，将其中的因碳-碳键破坏所造成的缺陷修补好，最终优化、提高膨胀石墨的性质和应用性能。

Expanded graphite possesses excellent properites, such as high temperature resistance, good heat conduction, chemical stability, good electronic conduction, self-lubrication, low density and flexiblity etc.,therefore, it can be applied in many fields, like heat insulation, sound insulation, fire extinguishing, lubrication and sealing materials under extreme conditions, electrode material, and super-low-S highly-pure nuclear-level flexible graphite. However, fabricated by the common method of chemical oxidization by using several kinds of oxidants and intercalating agents,the expanded graphite contains residue of the above-mentioned substances, besides, the chemical bonds of the expanded graphite will be damaged, which jeopardizes the properties of the expanded graphite. Our research project,by placing expanded graphite in plasma of carbon-containing gas such as methane,at a relatively low temperature of around 500℃, and through chemical reaction in PECVD system, will at the atomic and molecular level, without harming sp2 C-C bonds of the expanded graphite, etch the residue contained in the expanded graphite, and meanwhile, repair the defects generated duing the fabrication process of the expanded graphite. Therefore, the project will contrubute a lot to the optimization and improvement of the properties and performance of the expanded graphite.