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■ 외부초청 세미나

일시 : 2009. 3. 24(화), 16:00
연사 : Dr. 홍병희 (성균관대)
장소 : 응용공학동 1층 영상강의실
제목 : Synthesis and Applications of Large-Scale Graphene Films


Synthesis and Applications of
Large-Scale Graphene Films

Byung Hee Hong
Department of Chemistry and SKKU Advanced Institute of Nanotechnology

Problems associated with large-scale pattern growth of graphene constitute one of the main obstacles to using this material in device applications. Recently, macroscopic-scale graphene films were prepared by two-dimensional assembly of graphene sheets chemically derived from graphite crystals and graphene oxides. However, the sheet resistance of these films was found to be much larger than theoretically expected values. In this presentation, we introduce the direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers, and present two different methods of patterning the films and transferring them to arbitrary substrates. The transferred graphene films show very low sheet resistance of 280V per square, with 80 per cent optical transparency.
At low temperatures, the monolayers transferred to silicon dioxide substrates show electron mobility greater than 3,700cm2/Vs and exhibit the half-integer quantum Hall effect, implying that the quality of graphene grown by chemical vapour deposition is as high as mechanically cleaved graphene. Employing the outstanding mechanical properties of graphene, we also demonstrate the macroscopic use of these highly conducting and transparent electrodes in flexible, stretchable, foldable electronics.

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