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Rodney S. Ruoff
다차원 탄소재료 연구단
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Mesoscale Imperfections in MoS2 Atomic Layers Grown by a Vapor Transport Technique

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Title
Mesoscale Imperfections in MoS2 Atomic Layers Grown by a Vapor Transport Technique
Author(s)
Liu, YN; Ghosh, R; Wu, D; Ismach, A; Rodney S Ruoff; Lai, KJ
Publication Date
2014-08
Journal
NANO LETTERS, v.14, no.8, pp.4682 - 4686
Publisher
AMER CHEMICAL SOC
Abstract
The success of isolating small flakes of atomically thin layers through mechanical exfoliation has triggered enormous research interest in graphene and other two-dimensional materials. For device applications, however, controlled large-area synthesis of highly crystalline monolayers with a low density of electronically active defects is imperative. Here, we demonstrate the electrical imaging of dendritic ad-layers and grain boundaries in monolayer molybdenum disulfide (MoS2) grown by vapor transport technique using microwave impedance microscopy. The micrometer-sized precipitates in our films, which appear as a second layer of MoS2 in conventional height and optical measurements, show ~2 orders of magnitude higher conductivity than that of the single layer. The zigzag grain boundaries, on the other hand, are shown to be more resistive than the crystalline grains, consistent with previous studies. Our ability to map the local electrical properties in a rapid and nondestructive manner is highly desirable for optimizing the growth process of large-scale MoS2 atomic layers.
URI
https://pr.ibs.re.kr/handle/8788114/1480
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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