| 초록 |
Gas fluorination is useful method for surface modification of carbon materials. But, the crystal structure of the carbon materials can collapse by fluorine gas. Therefore, gas fluorination conditions need to be controlled depending on the crystal structure of the carbon materials. In this study, mesophase pitch (MP) was heat-treated at different temperatures (500, 1000 ℃) to manufacture carbon materials with different crystal structures. Gas fluorination of prepared samples was conducted at room temperature for 10 min with partial pressure of F2:N2 = 1:9 (FN19), 9:1 (FN91). Structural change appeared remarkably to fluorinated samples. Especially, the peek of the (002) plane was hardly observed in most of FN91 samples. However, structure of heat-treated sample at 1000 ℃ barely changed under the condition of FN91. This phenomenon seems to be caused by the formation of the carbon skeleton and the reduction of the sites capable of reacting with fluorine when heat-treated at 1000 ℃. |
