To explore new physics phenomena of low dimensional materials
with a special emphasis on two-dimensional layered structures
In this group, the main research activity is to synthesize 0D, 1D and 2D layered flakes under wet chemical reactions through an exfoliation method from bulk materials (top-down) and chemical solution reaction (bottom-up).
The newly synthesized 0D, 1D and 2D flakes and their 3D nano-structures are to be characterized through nanoscopy measurements. The new chemical, physical, electrical and optical properties of the newly synthesized 0D, 1D and 2D flakes and their 3D nano-structures is to reflect back to the wet chemical synthesis to have the improved properties of the 0D and 2D layered materials.
It is highly expected that new wet chemical synthesis of 0D, 1D and 2D layered materials and their 3D nano-structures through nanoscopy measurements and analyses will bring new fundamental findings and break-through research results.
Multi-layered 2D Materials
In the synthesis of single-layered 2D materials including TMDs, the multi-layered 2D materials can be prepared and then exfoliated to give the single-layered 2D materials. To prepare the multi-layered 2D bulk materials, we like to develop various wet chemical reactions such as hydrothermal reaction, microwave reaction and low temperature reactions to synthesize the multi-layered 2D bulk materials with large lateral sizes including TMDs materials.
One Directional and large lateral sized single layer 2D materials
To grow a one directional and large lateral sized single layered 2D materials under wet chemical reactions without an exfoliation has been a very important issue, but has not been easily accessible with several reasons. It is highly expected that the sterically bulky groups should be allowed to grow the single layered 2D materials by overcoming van der Waals interactions between neighboring single layered 2D materials and simultaneously allowed to grow one directional single layered 2D materials. It is also expected that depending on the reaction time, solvent, and temperature, the large lateral sized single layered 2D materials can be prepared.
Exfoliation methods for single-layered and large lateral sized 2D materials
To make single-layered and large lateral sized 2D materials from the multi-layered 2D bulk materials becomes import issues, especially for mass production with cheap prices. Until now, however, to get the large lateral sized 2D materials is not easy due to a weak bonding between metal and chalcogenide atoms. Here, we like to study/find optimised exfoliation conditions such as sterically hindered solvents, polar/nonpolar organic solvents, new organic functional ligands, temperature, pressure and etc. It is also very important for the real applications to develop highly concentrated 2D inks using the appropriate solvent system.
Due to a limitation of the use of only 2D materials for practical applications, a fabrication of 3D hybrid nano-structure using 2D layered materials is getting important issues. [1]
Another issue is band gap, the bandgap of most TMD 2D materials is different and characteristic. For finding an optimised performance of 3D nano-structure by using various different bandgap of the 2D materials, it is very interesting and also important to control or tune a band gap of 2D or 3D nano-structure for the specific applications. [2]
Professor
Hyoyoung Lee
Educational Background
Ph.D. Organic Chemistry, University of Mississippi
2015.11 ~ Present | Associate director of Center for Intergrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS) |
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2009.03 ~ 2015.02 | Professor of Dept. of Chemistry, Energy Science and SAINT, Sungkyunkwan University |
2006.04 ~ 2015.02 | Director of National Creative Research Initiative (NCRI), Center for Smart Molecular Memory |
2007 ~ 2009.02 | Adjunct Professor, University of Science and Technology, Korea |
2000 ~ 2009.02 | Principal Researcher, ETRI |
1999 ~ 2000 | Senior Researcher, POSTEC, Korea |
1997 ~ 1999 | Postdoctoral Research Associate, North Carolina State University, USA |
[1] “Prevention of sulfur diffusion using MoS2-intercalated 3D-nanostructured graphite for high-performance lithium-ion batteries”, Anand P. Tiwari, HeeJoun Yoo, JeongTaik Lee, Doyoung Kim, Jong Hyeok Park and Hyoyoung Lee*
[2] “An order/disorder/water junction system for highly efficient co-catalyst-free photocatalytic hydrogen generation”, Kan Zhang, Luyang Wang, Jung Kyu Kim, Ming Ma, Ganapathy Veerappan, Chang-Lyoul Lee, Ki-jeong Kong, Hyoyoung Lee* and Jong Hyeok Park*
Dr. So Hyun Seo