3D-to-2D phase transformation through highly ordered 1D crystals from transition-metal oxides to dichalcogenides |
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| Affiliation: | 1. Samsung Advanced Institute of Technology, Suwon 16678, Republic of Korea;2. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;3. Department of Physics, Yonsei University, Seoul 03722, Republic of Korea;4. Department of Semiconductor and Display Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;5. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea;1. Department of Physics, Yonsei University, Seoul, Republic of Korea;2. Department of Materials Science and Engineering, Seoul National University of Science and Technology (Seoultech), Seoul, South Korea;3. Department of System Semiconductor Engineering, Yonsei University, Seoul, Republic of Korea;1. Department of Physics, Yonsei University, Seoul 03722, Republic of Korea;2. Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Science, Mathematics and Technology Cluster, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore;3. Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 CleanTech Loop, Singapore 637141, Singapore;4. Environmental Process Modelling Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 CleanTech Loop, Singapore 637141, Singapore;1. Department of Materials Science and Engineering, & CAS Key Laboratory of Materials for Energy Conversion, & Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;2. The Sixth Element (Changzhou) Materials Technology Co., Ltd., Changzhou 213100, China;3. Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore;4. Centre for Advanced 2D Materials, National University of Singapore, 117546 Singapore, Singapore;5. National Graphene Institute, University of Manchester, Oxford Road, Manchester M13 9PL, UK;6. Chongqing 2D Materials Institute, Liangjiang New Area, Chongqing 400714, China;1. Department of Physics, Yonsei University, Yonsei-ro 50, Seoul 03722, Republic of Korea;2. Atomic-scale Surface Science Research Center, Yonsei-ro 50, Seoul 03722, Republic of Korea;3. Department of Material Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
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| Abstract: | 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. |
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