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나노 구조 물리 연구단
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Observing Grain Boundaries in CVD-Grown Mono layer Transition Metal Dichalcogenides

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Title
Observing Grain Boundaries in CVD-Grown Mono layer Transition Metal Dichalcogenides
Author(s)
Thuc Hue Ly; Ming-Hui Chiu; Li, MY; Jiong Zhao; David J. Perello; Magdalena Ola Cichocka; Hye Min Oh; Sang Hoon Chae; Hye Yun Jeong; Fei Yao; Li, LJ; Young Hee Lee
Publication Date
2014-11
Journal
ACS NANO, v.8, no.11, pp.11401 - 11408
Publisher
AMER CHEMICAL SOC
Abstract
Two-dimensional monolayer transition metal dichalcogenides (TMdCs), driven by graphene science, revisit optical and electronic properties, which are markedly different from bulk characteristics. These properties are easily modified due to accessibility of all the atoms viable to ambient gases, and therefore there is no guarantee that impurities and defects such as vacancies, grain boundaries, and wrinkles behave as those of ideal bulk. On the other hand, this could be advantageous in engineering such defects. Here, we report a method of observing grain boundary distribution of monolayer TMdCs by a selective oxidation. This was implemented by exposing directly the TMdC layer grown on sapphire without transfer to ultraviolet light irradiation under moisture-rich conditions. The generated oxygen and hydroxyl radicals selectively functionalized defective grain boundaries in TMdCs to provoke morphological changes at the boundary, where the grain boundary distribution was observed by atomic force microscopy and scanning electron microscopy. This paves the way towards the investigation of transport properties engineered by defects and grain boundaries.
URI
https://pr.ibs.re.kr/handle/8788114/738
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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