本論文研究石墨片浸泡於不同濃度的氯化鋁溶液與氯化膽鹼組成的深共晶溶液 (Deep Eutectic Solvent,DES)與不同溫度熱處理後的熱擴散係數、熱傳導係數，並與僅浸泡氯化鋁溶液之石墨片進行比較。
實驗顯示，無論是浸泡濃度1M或2M溶液的石墨片，其熱擴散係數與熱傳導係數皆隨著浸泡時間及熱處理溫度提升有正相關。此外，浸泡於相同濃度並進行相同溫度熱處理的石墨片，浸泡深共晶溶液之石墨片的熱擴散係數與熱傳導係數皆優於只浸泡氯化鋁溶液之石墨片。尤其是浸泡濃度為1M之深共晶溶液並進行600°C熱處理後的石墨片，其熱擴散係數與熱傳導係數為提升為最高。
浸泡深共晶溶液提升熱性質之原因是因深共晶溶液能提升溶液離子遷移率，使溶液中的鋁離子與石墨片表面的碳原子與氮原子產生鍵結形成高熱導率的碳化鋁及氮化鋁，提高聲子傳播的速率。
為了證實石墨片表面碳化鋁及氮化鋁的形成，本實驗使用XRD分析確認石墨片表面之晶體結構，再利用SEM與EDS觀察表面之微觀結構及化學成分，最後利用XPS確認Al-C與Al-N鍵結。
另外本實驗也對碳管紙之熱性質提升進行研究，使用不同濃度之深共晶溶液與氯化鋁溶液滴定至碳管紙表面，並進行不同溫度之熱處理。
實驗顯示，滴定濃度1M兩種溶液的碳管紙熱性質皆有提升，但是在2M之後熱性質皆有明顯的下降，推測其原因為溶液濃度太高會導致黏度過高，因此鋁離子不易與碳管紙表面之碳原子產生鍵結，因此過高的濃度會使熱擴散係數及熱傳導係數下降。

This study investigates the thermal conductivity and diffusivity of graphite sheets before and after immersion in deep eutectic solvents (DES) consisting of aluminum chloride and choline chloride. Graphite sheets are firstly soaked in DES composed of various concentrations of DES, followed by heat treatments at different temperatures. Different soaking durations were also examined and compared with samples treated using only AlCl₃ aqueous solutions. Experimental results show that graphite sheets soaked in either 1M or 2M solutions exhibit a positive correlation between thermal diffusivity/conductivity and both soaking time and heat treatment temperature. Furthermore, at the same concentration and heat treatment conditions, the graphite sheets soaked in DES consistently exhibited higher thermal diffusivity and conductivity compared to those only soaked in AlCl₃ solution. Notably, the graphite sheets soaked in 1M DES and heat-treated at 600°C display the highest thermal diffusivity and conductivity among all test conditions.
The enhancement in thermal properties after DES treatment is attributed to the increased ionic mobility provided by DES, which facilitates the interaction between aluminum ions in the solution and carbon/nitrogen atoms on the graphite surface. This produces high-thermal conductivity compounds such as aluminum carbide (Al₄C₃) and aluminum nitride (AlN), thereby improving phonon transport. To verify the formation of Al₄C₃ and AlN in graphite sheets, XRD analysis is performed to identify crystal structures and compositions. SEM and EDS are employed to characterize surface morphology and elemental distribution, and XPS is used to verify Al–C and Al–N bonding.
This study also explores the thermal conductivity of carbon nanotubes made conductive papers by drop-casting DES or AlCl₃ solutions with different concentrations onto the paper surfaces, followed by heat treatment at various temperatures. Results showed that thermal conductivity of carbon nanotube paper is improved with 1M solution treatments; however, as DES concentrations exceeds 2M the conductivity improvement becomes negative and underlying mechanism is likely due to increased viscosity at higher concentrations, which hinders effective ion diffusion and bonding between aluminum ions and the carbon atoms in the carbon paper.