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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Eventual Chemical Transformation of Metals and Chalcogens into Metal Chalcogenide Nanoplates through a Surface Nucleation-Detachment-Reorganization Mechanism

2018년 2월 7일 15시 19분 18초
INOR.P-170 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (목요일) 11:00~12:30
Inorganic Chemistry
저자 및
Gyeongbae Park, HEESEUNG YANG1, Hyewon Park, Unyong Jeong*
Department of Materials Science and Engineering, Pohang University of Science and Technology, Korea
1Department of Advanced Materials Engineering, Yonsei University, Korea
Many studies have reported the synthesis of two-dimensional (2D) nanoplates and nanosheets of the layer structured metal chalcogenides but also have reported various structures far from the 2D shape. In multicomponent compounds, the elemental concentrations keep changing during the reaction; hence, the reactions are considered to be nonstoichiometric from the nucleation and may include continuous changes in the structure and composition. The different shapes of the metal chalcogenides with the layered structure are attributed to the nonstoichiometric reactions. This study investigates a two-step chemical reaction as an extreme nonstoichiometric nucleation and growth. It reveals that the layer-structured metal chalcogenides (M2X3, M = Sb and Bi, X = Se and Te) with the R3m space group can be obtained by transforming premade pure chalcogen (Se, Te) thick nanorods or metal microparticles (Bi). By coupling our first principles calculations with a shape-prediction thermodynamic model, we have also examined and rationalized the shape/aspect ratio of the M2X3 nanocrystals under different experimental growth conditions. The tendency of anisotropic growth to form the 2D shapes during the transformations are discussed on the basis of experimental results and theoretical calculations