Presenter: Prof. Feng Ding, Ulsan National Institute of Science and Technology (UNIST), Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS)
Topic: The Kinetics of 2D Materials Growth—From Single Crystals to 2D Polycrystals
After the discovery of graphene, researches on two-dimensional (2D) materials attracted exhausting efforts attention. Until now, thousands of 2D materials have been predicted but only very few of them, such as graphene, h-BN and MoS2, can be synthesized in large area and high quality. To achieve the industrial synthesis of various 2D materials in large area and high quality, understanding the kinetics of their growth is of crucial importance.
In compare with the 3D crystals, 2D materials own their unique properties, such as the ultra-high flexibility and weak interaction with a substrate. Our research team has used various theoretical approaches, such as ab initio calculation, molecular dynamic (MD) simulation, kinetic Monte Carlo (KMC) simulation and phase field theory (PFT) simulation, to explore the kinetics of 2D materials’ growth for more than 10 years. Our studies have revealed a few key characteristics of 2D materials growth:
(i)the growth and etching of an edge of a 2D material is reversible and the rate of the growth or etching is determined by the structure of the edge,
(ii)The shape of a 2D materials during growth or etching is determined by its symmetry, the interaction with the substrate and can be precisely described by the kinetic Wullf construction,
(iii)Besides 2D single crystals, the experimentally synthesized 2D polycrystals can be predicted by theoretical analysis.
(iv)By considering the structures of various edges of a 2D materials, our theoretical calculation can precisely predict the environment dependent edge structure and the shape evolution during a 2D material’s growth and etching,
(v)Our theoretical study has revealed that the synthesis of single crystalline 2D materials in large area could be achieved by selecting proper substrates.
Prof. Feng Ding obtained his Bs, Ms and PhD degrees from Huazhong University of Science and Technology, Fudan University and Nanjing University in 1993, 1996 and 2002, respectively. Then he joined Gothenburg University and Chalmers University in Sweden from 2003 to 2005 as a Postdoctoral Research Fellow. From 2005, he joined Rice University as a Research Scientist until the end of 2008. From 2009, he worked in the Hong Kong Polytechnic University as an Assistant Professor and be promoted to an Associate Professor in 2013. From the beginning of 2017, he joined UNIST as a Distinguished Professor and the IBS-CMCM as a group leader.
Prof. Ding’s research group’s research interests mainly focus on the computational method development, theoretical exploration of various carbon materials and 2D materials, especially on their formation mechanisms, the kinetics of their nucleation, growth and etching. Prof. Ding coauthored more than 200 SCI papers in leading scientific journals, with > 40 in Science, Sci Adv., Nature serious journals, PNAS, PRL, JACS, ACIE. These publications were cited by > 10，000 times (Google Scholar) and his personal h-index is 56.