Mapping Graphene Grain Orientation by the Growth of WS2 Films with Oriented Cracks

Title
Mapping Graphene Grain Orientation by the Growth of WS2 Films with Oriented Cracks
Authors
김선준Da Luo박강호최명기김대우Meihui Wang정우빈이종훈Rodney S. Ruoff정희태
Keywords
Graphene; WS2; grain visualization
Issue Date
2020-09
Publisher
Chemistry of materials
Citation
VOL 32, NO 17-7491
Abstract
We map the lattice orientation of graphene grains (domains) larger than a centimeter by measuring the orientation of cracks in a WS2 film grown on graphene that had been previously grown by chemical vapor deposition (CVD) on Cu foils. A WO3 film was first deposited on the graphene film and then converted to a WS2 film by CVD sulfurization. The WS2 film was found to contain cracks that, as found by electron diffraction and optical birefringence, are always aligned along the armchair direction of the graphene lattice. We find that this method is significantly advanced compared to any published methods for the analysis of the grain structure, as it provides simultaneous and high-contrast mapping of grain orientation without needing further analysis.
URI
http://pubs.kist.re.kr/handle/201004/71854
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
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