電化學剝離石墨烯之優化

Optimizing Electrochemical Exfoliation of Graphene

傅家緯(Chia-Wei Fu)

指導教授 ： 謝雅萍

國立中正大學/工學院/光機電整合工程研究所/碩士(2013年)

摘要

利用電流化學效應將石墨電極剝離石墨烯於電解液中，此電化學剝離法已被視為一種簡單、低成本、且快速的石墨烯製備方法，同時具有優異的延展性，以及無需任何化學蝕刻進行轉印。由於此方法的發展仍為初步階段，因此需要更深入的了解與探討電化學法剝離法的機制。
本實驗在電化學剝離過程中，透過電壓參數與電解液的調變，除了進行詳細的剝離效率分析外，也藉由拉曼光譜儀量測以及光穿透度量測結果，進而取得提高石墨烯的品質與減少其厚度的參數趨勢。除此之外，在所有水溶液製備石墨烯的領域中，電化學法所製備的石墨烯在電性量測的表現具有重大的進步。
電化學剝離法透過一套簡單的實驗模組即可進行以上所有的實驗結果與觀測，且如此快速、低成本的方法對於未來石墨烯在商業應用方面如鋰電池電極、透明導電膜等將會有很大的幫助。

關鍵字: 石墨烯、電化學剝離

關鍵字

電化學剝離 ； 石墨烯

並列摘要

Electrochemical exfoliation has been demonstrated to be a simple, low cost and fast method to exfoliate graphite. The graphite electrode can be electrochemically charged and expanded in an aqueous electrolyte. The electrochemical exfoliation process shows advantages of scalability, and minimal use of etching chemicals. Despite initial results, the optimization of the electrochemical exfoliation process requires better understanding of the mechanism.
We here present a detailed analysis of the exfoliation process. Through in-situ measurements, the dependence of the exfoliation yield on the electrical parameters and chemical constituents are revealed.
Raman analysis and optical absorption measurements furthermore show that optimized exfoliation steps can increase the graphene quality and reduce the thickness.
Finally, Electrical measurements demonstrate the improved performance of devices derived from solution-processed graphene.
All these experimental observations were unified into a simple model of the exfoliation process. This work can help improve the commercial application of graphene as functionalized films, battery electrodes or transparent conductors.

Keyword: Graphene, electrochemical exfoliation

並列關鍵字

Electrochemical exfoliation ； Graphene

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