| 학회 | 한국재료학회 |
| 학술대회 | 2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 | 25권 2호 |
| 발표분야 | 특별심포지엄8. 2차원 하이브리드 물질의 에너지·센서 응용 기술 심포지엄-오거나이저:이철호(고려대) |
| 제목 | Programming 2D Materials Properties via Defect Design and Characterization |
| 초록 | We propose programming of graphene properties via defect design and functionalization, and to elucidate the correlations between defects and electrical, optical, physicochemical properties by experimental and theoretical collaborations. To achieve this goal, we first focused on developing a new strategy to very fast and facile synthesis of large scale single crystal graphene on conventional cheap metal foils. For this, polycrystal Cu foils were converted to single crystal Cu(111) foils through a high-temperature annealing processes, then the sodium chloride additive was introduced during CVD growth of graphene. DFT calculations support these experimental findings by showing, for example, that oxygen atoms readily desorb in the presence of sodium ions, which results in an increase of nucleation density, as well as in possibly assisting in the healing of defects, thus enabling seamless stitching. In this process, single-crystal graphene can be achieved through seamless stitching of hexagonal graphene flakes(GFs) in a very short time (＜90s). This study advances large scale growth of single crystal graphene on cheap metal foil. With this mechanism, we could produce polygonal GFs with crystallographically well-defined edges. Importantly, we found that hexagonally shaped flakes having zigzag edges grow on Cu (111) surface while rectangular-shaped graphene flakes having two types of edges (i.e. zigzag and armchair edges) grow on Cu (100) surfaces. Based on these results, we will continue our strong experimental and theoretical collaboration for (i) understating the fundaments at the atomic-scale, thus elucidating correlations between defects and properties and (ii) programming of predictable and improved performance with certain defect design and functionalization of graphene and TMDCs. |
| 저자 | 박원일 |
| 소속 | 한양대 |
| 키워드 | <P>2D materials; graphene; TMDCs</P> |
