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Nano Research

Article Title

Transformation of monolayer MoS2 into multiphasic MoTe2: Chalcogen atom-exchange synthesis route

Authors

Qiyi Fang, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Zhepeng Zhang, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Qingqing Ji, Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Siya Zhu, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Applied Physics and Technology, Peking University, Beijing 100871, China
Yue Gong, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Collaborative Innovation Center of Quantum Matter, Beijing 100190, China School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
Yu Zhang, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Jianping Shi, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Xiebo Zhou, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
Lin Gu, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Collaborative Innovation Center of Quantum Matter, Beijing 100190, China School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
Qian Wang, Center for Applied Physics and Technology, Peking University, Beijing 100871, China Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
Yanfeng Zhang, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China

Keywords

transition-metal dichacogenide, MoTe2, atom exchange, multiphase, phase transformation

Abstract

ABSTRACT Molybdenum ditelluride (MoTe2), which is an important transition-metal dichalcogenide, has attracted considerable interest owing to its unique properties, such as its small bandgap and large Seebeck coefficient. However, the batch production of monolayer MoTe2 has been rarely reported. In this study, we demonstrate the synthesis of large-domain (edge length exceeding 30 μm), monolayer MoTe2 from chemical vapor deposition-grown monolayer MoS2 using a chalcogen atom-exchange synthesis route. An in-depth investigation of the tellurization process reveals that the substitution of S atoms by Te is prevalently initiated at the edges and grain boundaries of the monolayer MoS2, which differs from the homogeneous selenization of MoS2 flakes with the formation of alloyed Mo−S−Se hybrids. Moreover, we detect a large compressive strain (approximately −10%) in the transformed MoTe2 lattice, which possibly drives the phase transition from 2H to 1T’ at the reaction temperature of 500 °C. This phase change is substantiated by experimental facts and first-principles calculations. This work introduces a novel route for the templated synthesis of two-dimensional layered materials through atom substitutional chemistry and provides a new pathway for engineering the strain and thus the intriguing physics and chemistry.

Graphical Abstract

Publisher

Tsinghua University Press

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