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A New Horizon for Hexagonal Boron Nitride Film
김기강,김수민,이영희 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
Growth of hexagonal boron nitride (hBN), an isomorph of graphene/graphite, has been highlighteddue to its highly insulating and transparent properties, in parallel with highly-conductinggraphene counterpart, which could be useful for numerous applications. Nevertheless, difficultyarises from the absence of robust synthesis methods that provide large-area and high-quality hBNwith controlled number of layers. In this article, we review the recent development for the synthesisof hBN with various approaches including liquid-metal, ultra-high-vacuum chemical vapordeposition (UHVCVD), and low-pressure CVD (LPCVD) methods. Its fundamental physical andchemical properties and its potential applications are further discussed. We expect that our comprehensiveoverview of the synthesis method of hBN will provide a route to find an ultimate methodof synthesizing large-area and high-quality hBN with controlled number of layers.
Synthesis of 2D materials by using chemical vapor deposition
김기강 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Recently, two-dimensional (2D) materials including graphene, hexagonal boron nitride, and transition metal dichalcogendes (MoS2, MoSe2, WS2, and WSe2) have been highlighted due to their unique properties such as new physical, chemical properties as well as new applications in various fields. However, it is still challenge to obtain the large area and high quality 2D materials. In this presentation, we will overview the recent progress of the synthesis of 2D materials as well as their growth mechanism. Fundamental physical and chemical properties and potential applications of each material are further presented. We expect that our overview will provide a route to find an ultimate way for synthesizing large- area and high-quality 2D materials.
경홍장,김기강,KYU LEE,GIL YONG KIM,HA KYU CHOI,DAE SIK LEE,안계혁,이영희 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.3
Several single-walled carbon nanotubes (SWCNTs) prepared by different methods have been used to investigate the material dependence on the optimal film performance of flexible transparent conducting films. The nanotubes were dispersed in water with sodium dodecyl sulfate by sonication. These SWCNT solutions were then sprayed onto the Poly(ethylene terephthalate) substrate by a spray coater to form the film. Several factors such as purity, diameter, defects, metallicity, and degree of dispersion were evaluated individually to examine how they affect the film performance. We found that the metallicity of SWCNTs and the degree of dispersion are the most crucial factors in determining the film performance. We also proposed a material quality factor to estimate the material quality of SWCNTs as a figure of merit for the film performance.
A systematic study of the synthesis of monolayer tungsten diselenide films on gold foil
윤석준,김수민,김기강,이영희 한국물리학회 2016 Current Applied Physics Vol.16 No.9
We report a systematic study of the synthesis of large-area monolayer WSe2 on gold foil by controlling the growth temperature and the partial pressure of hydrogen during chemical vapor deposition. The gold surface causes surface-mediated growth to form monolayer WSe2 films. The amount of the tungsten source is controlled by adjusting the partial pressure of hydrogen, which plays a role in the reduction of WO3 (solid phase) into WO3x (vapor phase). The coverage of monolayer WSe2 can be effectively controlled by changing either the partial pressure of hydrogen or the growth temperature at a fixed growth time under an Se-rich atmosphere, resulting in 100% coverage of the WSe2 film. The crystallinity and thickness uniformity are characterized by Raman spectroscopy, photoluminescence, and transmission electron microscopy. This characterization reveals that the quality of the WSe2 film is comparable to mechanically-exfoliated monolayer WSe2 and possesses good thickness uniformity.