Please use this identifier to cite or link to this item: https://doi.org/10.1021/acs.chemmater.6b00379
Title: Dynamic Structural Evolution of Metal-Metal Bonding Network in Monolayer WS2
Authors: Amara, Kiran Kumar
Chen, Yifeng 
Lin, Yung-Chang
Kumar, Rajeev 
Okunishi, Eiji
Suenaga, Kazu
Quek, Su Ying 
Eda, Goki 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
PHASE-TRANSITION
MOS2 NANOSHEETS
HYDROGEN EVOLUTION
ATOMIC MECHANISM
LAYER
DICHALCOGENIDES
MOTE2
STATE
Issue Date: 12-Apr-2016
Publisher: AMERICAN CHEMICAL SOCIETY
Citation: Amara, Kiran Kumar, Chen, Yifeng, Lin, Yung-Chang, Kumar, Rajeev, Okunishi, Eiji, Suenaga, Kazu, Quek, Su Ying, Eda, Goki (2016-04-12). Dynamic Structural Evolution of Metal-Metal Bonding Network in Monolayer WS2. CHEMISTRY OF MATERIALS 28 (7) : 2308-2314. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.chemmater.6b00379
Abstract: © 2016 American Chemical Society. Layered transition metal dichalcogenides (TMDs) exist in a range of crystal phases with distinct electronic character. Some crystal phases are known to exhibit unique in-plane anisotropy characterized by a periodic distortion of the lattice and a formation of metal-metal bonding network. Here, we report in situ observation of dynamic structural evolution in the one-dimensional zigzag chains of single layer WS2 induced by electron beam irradiation. Metastable zigzag chains of tungsten atoms are found to undergo reorganization of metal-metal bonds, resulting in emergence of tetramer clusters and zigzag chains with a new orientation. Our first-principles calculations reveal a small (∼0.1 eV per formula unit) activation energy barrier for monolayer WS2 zigzag chain reorientation and a metastable transition state in the form of tetramer clusters. We further show that local tetramer clusters can be induced and stabilized by local electronic charging effects. The formation of local tetramer clusters indicate that this dynamic structural evolution is not a charge density wave phenomenon; we find instead that these lattice changes are a response to electronic instabilities that weaken the W-S bonds in the zigzag phase. Our findings shed light on the origin of structural instabilities and phases in two-dimensional materials, and constitute a step further toward their potential uses in phase change applications.
Source Title: CHEMISTRY OF MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/170913
ISSN: 08974756
15205002
DOI: 10.1021/acs.chemmater.6b00379
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