Carbon nanotubes and graphene; 2D materials; Energy materials.
Prof.
Hui-Ming Cheng is the director of the Institute of Technology for Carbon
Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of
Sciences (CAS). He is concurrently the director of the Advanced Carbon Research
Division of Shenyang National Laboratory for Materials Science, Institute of
Metal Research, CAS. He is a member of CAS and a fellow of TWAS.
His
research activities mainly focus on energy materials and devices, carbon
nanotubes, graphene, and other 2D materials. He published over 900 papers with
an h-index of 165 and is a Highly Cited Researcher in three fields materials
science, chemistry, and environment and ecology. He has given over 220
plenary/keynote/invited lectures at various conferences and won many domestic
and international awards. He is now the founding Editor-in-Chief of Energy
Storage Materials and has spun off several high-tech companies.
Explorations of new 2D materials and their new properties
Identification
of two-dimensional (2D) materials in the monolayer limit has led to discoveries
of new phenomena and unusual properties. In this lecture, I’ll first report the
growth of large-area high-quality 2D ultrathin Mo2C crystals by CVD , which show
2D characteristics of superconducting transitions that are consistent with
Berezinskii–Kosterlitz–Thouless behaviour and show strong dependence of the
superconductivity on the crystal thickness. Furthermore, when we introduce
elemental silicon during CVD growth of nonlayered molybdenum nitride, we have
grown centimeter-scale monolayer films of MoSi2N4 which does not exist in
nature and exhibits semiconducting behavior, high strength, and excellent
ambient stability. On the other hand, we have found some interesting
properties from well-known 2D materials such as h-BN. For example, a class of
membranes assembled with 2D transition-metal phosphorus trichalcogenide
nanosheets give exceptionally high ion conductivity and superhigh lithium ion
conductivity. We even demonstrate an anomalously large
magneto-birefringence effect in transparent suspension of magnetic 2D crystals, with orders of magnitude larger than that in previously known transparent
materials. Moreover, based on this phenomenon, we develop a stable and
birefringence-tunable deep-ultraviolet modulator from 2D hexagonal boron
nitride which gives rise to a ultra-high specific magneto-optical Cotton–Mouton
coefficient, about five orders of magnitude higher than other potential deep-ultraviolet-transparent
media. Very recently, we have found that strong bulk van der Waals
materials can be densified from their nanosheets at near room temperatures with
mediation of water. These findings indicate a great promise of 2D
materials.
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