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Article overview
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Capture the growth kinetics of CVD growth of two-dimensional MoS2 | | Dancheng Zhu
; Haibo Shu
; Feng Jiang
; Danhui Lv
; Vijay Asokan
; Omar Omar
; Jun Yuan
; Ze Zhang
; Chuanhong Jin
; | | Date: |
16 Dec 2016 | | Abstract: | Understanding the microscopic mechanism of chemical vapor deposition (CVD)
growth of two-dimensional molybdenum disulfide (2D MoS2) is a fundamental issue
towards the function-oriented controlled growth. In this work, we report
results on revealing the growth kinetics of 2D MoS2 via capturing the
nucleation seed, evolution morphology, edge structure and terminations at the
atomic scale during CVD growth using the transmission electron microscopy (TEM)
and scanning transmission electron microscopy (STEM) studies. The direct growth
of few- and mono-layer MoS2 onto graphene based TEM grids allow us to perform
the subsequent TEM characterization without any solution-based transfer. Two
forms of seeding centers are observed during characterizations: (i)
Mo-oxysulfide (MoOxS2-y) nanoparticles either in multi-shelled fullerene-like
structures or in compact nanocrystals for the growth of fewer-layer MoS2; (ii)
Mo-S atomic clusters in case of monolayer MoS2. In particular, for the
monolayer case, at the early stage growth, the morphology appears in irregular
polygon shape comprised with two primary edge terminations: S-Mo Klein edge and
Mo zigzag edge, approximately in equal numbers, while as the growth proceeds,
the morphology further evolves into near-triangle shape in which Mo zigzag edge
predominates. Results from density-functional theory calculations are also
consistent with the inferred growth kinetics, and thus supportive to the growth
mechanism we proposed. In general, the growth mechanisms found here should also
be applicable in other 2D materials, such as MoSe2, WS2 and WSe2 etc. | | Source: | arXiv, 1612.5337 | | Services: | Forum | Review | PDF | Favorites | |
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