Transformation of monolayer MoS2 into multiphasic MOTe2: Chalcogen atom-exchange synthesis route

doi:10.1007/s12274-017-1480-z

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	Transformation of monolayer MoS2 into multiphasic MOTe2: Chalcogen atom-exchange synthesis route
	Qiyi Fang ; Zhepeng Zhang ; Qingqing Ji ; Siya Zhu ; Yue Gong ; Yu Zhang ; Jianping Shi ; Xiebo Zhou ; Lin Gu ; Qian Wang ; Yanfeng Zhang
刊名	纳米研究（英文版）
	2017
关键词	transition-metal dichacogenide MoTe2 atom exchange multiphase phase transformation transition-metal dichacogenide MoTe2 atom exchange multiphase phase transformation CHEMICAL-VAPOR-DEPOSITION TRANSITION-METAL DICHALCOGENIDES FEW-LAYER MOTE2 OPTICAL-PROPERTIES CATION-EXCHANGE SINGLE-CRYSTAL THIN-FILMS BAND-GAP GROWTH PHASE
DOI	10.1007/s12274-017-1480-z
英文摘要	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 ℃.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.; 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 ℃.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.; We acknowledge financial support by National Natural Science Foundation of China; the National High-tech R&D Program of China; the National Basic Research Program of China; the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics; the Strategic Priority Research Program of Chinese Academy of Sciences; the Key Research Program of Frontier Sciences,CAS; SCI(E); 中国科学引文数据库(CSCD); 8; 2761-2771; 10
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/462431]
专题	工学院
推荐引用方式 GB/T 7714	Qiyi Fang,Zhepeng Zhang,Qingqing Ji,et al. Transformation of monolayer MoS2 into multiphasic MOTe2: Chalcogen atom-exchange synthesis route[J]. 纳米研究（英文版）,2017.
APA	Qiyi Fang.,Zhepeng Zhang.,Qingqing Ji.,Siya Zhu.,Yue Gong.,...&Yanfeng Zhang.(2017).Transformation of monolayer MoS2 into multiphasic MOTe2: Chalcogen atom-exchange synthesis route.纳米研究（英文版）.
MLA	Qiyi Fang,et al."Transformation of monolayer MoS2 into multiphasic MOTe2: Chalcogen atom-exchange synthesis route".纳米研究（英文版） (2017).