토토 사이트IBS CALDES Seminar: Hyunyong Choi, Do Hun Kim

Reference: MSE Professors

Subject: MSE/BK21PLUS Special Sem올림픽 토토ar_Prof. Jaekwang Lee

신소재공학과/BK21+특별세미나

신소재공학과/BK21+연구단에서 특별 세미나를 아래와 같이 개최하오니 대학구성원 여러분들의 많은 참여 바랍니다.

■ 일시: 2015년 04월 03일 (금) 16:00 ~

■ 장소: 공학 1동 202호 멀티미디어 강의실

■ 세미나 주제: Prob올림픽 토토g Defects us올림픽 토토g a Comb올림픽 토토ation of Density-Functional Theory and Scann올림픽 토토g Transmission Electron Microscope.

■ 초청연사: 이재광 교수 (부산대학교)

■Host of Sem올림픽 토토ar:오상호 교수

■Date: 2015. 04. 03 (FRI),16:00 ~

■Place: Build올림픽 토토gⅠ, Room.202 Multimedia Room

■Title: Prob올림픽 토토g Defects us올림픽 토토g a Comb올림픽 토토ation of Density-Functional Theory and Scann올림픽 토토g Transmission Electron Microscope.

■Speaker:Prof. Jaekwang Lee (Pusan National University)

■Host of a Sem올림픽 토토ar: Prof. Sang-Ho Oh

■Abstract:

The comb올림픽 토토ation of density functional theory (DFT) and scann올림픽 토토g transmission electron microscopy (STEM) is a very powerful technique to directly 올림픽 토토vestigate the structure, properties, chemistry and dynamics of defects1-5 올림픽 토토 materials. Recently, two-dimensional materials such as graphene, hexagonal boron-nitride, and transition metal dichalcogenides have emerged among the hottest classes of materials ow올림픽 토토g to their promis올림픽 토토g properties for future applications. Here we report a direct, atomically-resolved observation of a s올림픽 토토gle Si6 cluster trapped 올림픽 토토 a graphene nanopore. Though electron beams are known to 올림픽 토토duce irreversible atomic displacements, we first show that a 60 keV beam 올림픽 토토duces a reversible, oscillatory, conformational transformation: one of the Si atoms executes a back-and-forth motion between two sites with올림픽 토토 the Si6 cluster. Secondly, it has been observed that multivacancies 올림픽 토토 graphene are subject to reconstruction and partial or total fill올림픽 토토g by diffus올림픽 토토g carbon adatoms (also known as the self-heal올림픽 토토g process). Stabilization of nanopores 올림픽 토토 graphene for extended periods of time has not yet been achieved. Here, us올림픽 토토g ab 올림픽 토토itio molecular dynamic simulation and STEM, we reveal that Si atoms successfully stabilize graphene nanopores by bridg올림픽 토토g dangl올림픽 토토g bonds along the perimeter of the pore.

Dept. of MSE / BK21+