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https://hdl.handle.net/10356/151437
Title: | Phase-controlled synthesis of monolayer ternary telluride with a random local displacement of tellurium atoms | Authors: | Tang, Bijun Zhou, Jiadong Sun, Pingping Wang, Xiaowei Bai, Lichun Dan, Jiadong Yang, Jiefu Zhou, Kun Zhao, Xiaoxu Pennycook, Stephen J. Liu, Zheng |
Keywords: | Engineering::Materials | Issue Date: | 2019 | Source: | Tang, B., Zhou, J., Sun, P., Wang, X., Bai, L., Dan, J., Yang, J., Zhou, K., Zhao, X., Pennycook, S. J. & Liu, Z. (2019). Phase-controlled synthesis of monolayer ternary telluride with a random local displacement of tellurium atoms. Advanced Materials, 31(23), 1900862-. https://dx.doi.org/10.1002/adma.201900862 | Project: | NRF-RF2013-08 M4081137.070 MOE2015-T2-2-007 MOE2016-T2-2-153 RG7/18 MOE2017-T2-2-139 RG174/15 |
Journal: | Advanced Materials | Abstract: | Alloying 2D transition metal dichalcogenides has opened up new opportunities for bandgap engineering and phase control. Developing a simple and scalable synthetic route is therefore essential to explore the full potential of these alloys with tunable optical and electrical properties. Here, the direct synthesis of monolayer WTe2xS2(1−x) alloys via one-step chemical vapor deposition (CVD) is demonstrated. The WTe2xS2(1−x) alloys exhibit two distinct phases (1H semiconducting and 1T ′ metallic) under different chemical compositions, which can be controlled by the ratio of chalcogen precursors as well as the H2 flow rate. Atomic-resolution scanning transmission electron microscopy–annular dark field (STEM-ADF) imaging reveals the atomic structure of as-formed 1H and 1T ′ alloys. Unlike the commonly observed displacement of metal atoms in the 1T ′ phase, local displacement of Te atoms from original 1H lattice sites is discovered by combined STEM-ADF imaging and ab initio molecular dynamics calculations. The structure distortion provides new insights into the structure formation of alloys. This generic synthetic approach is also demonstrated for other telluride-based ternary monolayers such as WTe2xSe2(1−x) single crystals. | URI: | https://hdl.handle.net/10356/151437 | ISSN: | 0935-9648 | DOI: | 10.1002/adma.201900862 | Schools: | School of Materials Science and Engineering School of Mechanical and Aerospace Engineering School of Electrical and Electronic Engineering |
Research Centres: | Nanyang Environment and Water Research Institute Environmental Process Modelling Centre Centre for Micro-/Nano-electronics (NOVITAS) CNRS International NTU THALES Research Alliances Environmental Chemistry and Materials Centre |
Rights: | © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | MSE Journal Articles |
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