3D-to-2D phase transformation through highly ordered 1D crystals from transition-metal oxides to dichalcogenides

Hyangsook Lee, Yeonchoo Cho, Kwang Sik Jeong, Taejin Park, Mirine Leem, Wonsik Ahn, Hoijoon Kim, Jung Hwa Kim, Heegu Kim, Mann Ho Cho, Eunha Lee, Hyoungsub Kim, Sung Woo Hwang

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1 Citation (Scopus)


Although solid-state phase transformations through chemical reaction with the surrounding environment are important in the field of materials science, the atomic-level dynamics at reacting surfaces have been difficult to observe directly. Herein, we found highly ordered arrays of 1D intermediate crystals with a unique atomic configuration during the thermal sulfidation of 3D-structured MoO2 to 2D layer-structured MoS2. These arrays reveal a dimension-breaking reconstruction process (3D → 1D → 2D) as well as a unique electronic structure evolution. Theoretical calculations show that the 1D crystals have a cross-sectional structure of four transition-metal atoms arranged in a diamond shape; these are critical to the atomic layer-by-layer formation of 2D transition-metal dichalcogenides. Furthermore, electronic structure analyses reveal that the 1D intermediate crystals alter the MoO2/MoS2 contact structure from p- to n-type with increases in the number of formed MoS2 layers.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalMaterials Today
Publication statusPublished - 2021 Jul 1

Bibliographical note

Funding Information:
Funding: Mirine Leem, Wonsik Ahn, Hoijoon Kim, and Hyoungsub Kim received support from the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning [grant no. NRF-2014R1A4A1008474]. The raw and processed data required to reproduce these findings are available from the corresponding authors upon reasonable request.

Publisher Copyright:
© 2021 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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