| 학회 | 한국공업화학회 |
| 학술대회 | 2015년 봄 (04/29 ~ 05/01, BEXCO (부산)) |
| 권호 | 19권 1호 |
| 발표분야 | (콜로이드계면화학) 나노소재 기술에 있어서 콜로이드 공학의 응용 (중앙대 임경희 교수 정년 퇴임 기념) |
| 제목 | Two-dimensional interfacial assembly of graphene platelets |
| 초록 | Study of colloidal self-assembly is much strong simulation tool for understaning genral chemistry phenomena and it is also very helpful to develop the concept of tiny chemical factories, which are manufactured simultaneously. Although it is ture that solution-based techniques are considered as scalable and economical mass production of graphene, lack of understanding about graphene platelet properties as a colloid and reliable production method for producing graphene as abuilding units make lower the progression of colloidal graphene applications. Practically, to understand colloidal movement or other characters of graphene paltelets, reliable suppliment of graphene building units is the first consideration. After an intensive and extensive search for appropriate solvents, highly concentrated colloidal suspensions of almost single-layered graphene sheets have been obtained by chemically exfoliated graphene oxide but it still needs additional costly reduction process for deteriorated original properties. On the other hand, high quality graphene also acquired by sonication of graphite in organic solvents such as NMP (N-methylpyrrolidone) for a very long time. Hoever, the concentration of the suspension and yield of single layers were quite low and work in improving issues is still needed. Therefore, in this study, we suggested much improved, efficient way for mass production of high quality graphene. This sophisticated electrochemical exfoliation method can procure of consistent quality of graphene platelets generation. Using these building units, solution processing of pristine graphene based films was fabricated. Typically, graphene condicting film has great potential for the development of transparent electrodes, surface coatings, composites, sensors and separation membranes. However, the low solution compatibility of pristine graphene precludes the use of conventional processing methods such as drop-casting, spin-coating, and rod-coating. Here we report a rapid robust method for assembling pristine graphene platelets into a large area uniform film at a liquid-air interface. The platelets are assembled at the surface of a dilute suspension using an evaporation-driven Rayleigh-Taylor instability and then are driven together by Marangoni forces. The platelets are fixed through physical binding of their edges. Typically, 8-cm-diameter circular graphene films are generated within two minutes. Once formed, the films can be transferred onto various substrates with flat or textured topologies. This interfacial assembly protocol is applicable to other nanomaterials, including 0D fullerene and 1D carbon nanotubes, which commonly suffer from limited solution compatibility. |
| 저자 | 심종원1, 김상욱2 |
| 소속 | 1아모레퍼시픽 기술(연), 2KAIST |
| 키워드 | graphene; self-assembly; film |
