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Ding, Feng
IBS - Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Theoretical methods development for materials studies.
  • The formation mechanism of various carbon materials, from fullerene to carbon nanotube and graphene.
  • Kinetics and thermodynamics of materials growth and etching.
  • The structure, properties and fundamentals of nanomaterials.
  • The experimental synthesis of carbon nanotubes.

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Multiple 2D Phase Transformations in Monolayer Transition Metal Chalcogenides

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Title
Multiple 2D Phase Transformations in Monolayer Transition Metal Chalcogenides
Author
Hong, JinhuaChen, XiLi, PaiKoshino, MasanoriLi, ShishengXu, HuaHu, ZhixinDing, FengSuenaga, Kazu
Issue Date
2022-04
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS
Abstract
Phase transformation lies at the heart of materials science because it allows for the control of structural phases of solids with desired properties. It has long been a challenge to manipulate phase transformations in crystals at the nanoscale with designed interfaces and compositions. Here in situ electron microscopy is employed to fabricate novel 2D phases with different stoichiometries in monolayer MoS2 and MoSe2. The multiphase transformations: MoS2 -> Mo4S6 and MoSe2 -> Mo6Se6 which are highly localized with atomically sharp boundaries are observed. Their atomic mechanisms are determined as chalcogen 2H <-> 1T sliding, cation shift, and commensurate lattice reconstructions, resulting in decreasing direct bandgaps and even a semiconductor-metal transition. These results will be a paradigm for the manipulation of multiphase heterostructures with controlled compositions and sharp interfaces, which will guide the future phase engineered electronics and optoelectronics of metal chalcogenides.
URI
https://scholarworks.unist.ac.kr/handle/201301/58655
URL
https://onlinelibrary.wiley.com/doi/10.1002/adma.202200643
DOI
10.1002/adma.202200643
ISSN
0935-9648
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