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Revealing the Role of Gold in the Growth of Two-Dimensional Molybdenum Disulfide by Surface Alloy Formation

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Title
Revealing the Role of Gold in the Growth of Two-Dimensional Molybdenum Disulfide by Surface Alloy Formation
Author(s)
Inkyung Song; Hee Cheul Choi
Publication Date
2019-02
Journal
CHEMISTRY-A EUROPEAN JOURNAL, v.25, no.9, pp.2337 - 2344
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The formation of Mo/Au surface alloy during Au-assisted chemical vapor deposition (CVD) of MoS 2 is confirmed by a series of control experiments. A metal–organic chemical vapor deposition (MOCVD) system is adapted to conduct two-dimensional MoS 2 growth in a controlled environment. Sequential injection of Mo and S precursors, which does not yield any MoS 2 on SiO 2 /Si, grows atomically thin MoS 2 on Au, indicating the formation of an alloy phase. Transmission electron microscopy of a cross-section of the specimen confirms the confinement of the alloy phase near the surface only. These results show that the reaction intermediate is the surface alloy, and that the role of Au in the Au-assisted CVD is the formation of an atomically thin reservoir of Mo near the surface. This mechanism is clearly distinguished from that of MOCVD, which does not involve the formation of any alloy phases. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI
https://pr.ibs.re.kr/handle/8788114/5708
ISSN
0947-6539
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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