Atomic Insights into Phase Evolution in Ternary Transition-Metal Dichalcogenides Nanostructures

Zou, Yi-Chao, Chen, Zhi-Gang, Liu, Shijian, Aso, Kohei, Zhang, Chenxi, Kong, Fantai, Hong, Min, Matsumura, Syo, Cho, Kyeongjae and Zou, Jin (2018) Atomic Insights into Phase Evolution in Ternary Transition-Metal Dichalcogenides Nanostructures. Small (Weinheim an der Bergstrasse, Germany), e1800780. doi:10.1002/smll.201800780


Author Zou, Yi-Chao
Chen, Zhi-Gang
Liu, Shijian
Aso, Kohei
Zhang, Chenxi
Kong, Fantai
Hong, Min
Matsumura, Syo
Cho, Kyeongjae
Zou, Jin
Title Atomic Insights into Phase Evolution in Ternary Transition-Metal Dichalcogenides Nanostructures
Journal name Small (Weinheim an der Bergstrasse, Germany)   Check publisher's open access policy
ISSN 1613-6829
Publication date 2018-05-02
Sub-type Article (original research)
DOI 10.1002/smll.201800780
Open Access Status Not yet assessed
Start page e1800780
Abstract Phase engineering through chemical modification can significantly alter the properties of transition-metal dichalcogenides, and allow the design of many novel electronic, photonic, and optoelectronics devices. The atomic-scale mechanism underlying such phase engineering is still intensively investigated but elusive. Here, advanced electron microscopy, combined with density functional theory calculations, is used to understand the phase evolution (hexagonal 2H→monoclinic T'→orthorhombic T ) in chemical vapor deposition grown Mo W Te nanostructures. Atomic-resolution imaging and electron diffraction indicate that Mo W Te nanostructures have two phases: the pure monoclinic phase in low W-concentrated (0 < x ≤ 10 at.%) samples, and the dual phase of the monoclinic and orthorhombic in high W-concentrated (10 < x < 90 at.%) samples. Such phase coexistence exists with coherent interfaces, mediated by a newly uncovered orthorhombic phase T '. T ', preserves the centrosymmetry of T' and provides the possible phase transition path for T'→T with low energy state. This work enriches the atomic-scale understanding of phase evolution and coexistence in multinary compounds, and paves the way for device applications of new transition-metal dichalcogenides phases and heterostructures.
Keyword 2D materials
electron microscopy
metal dichalcogenides
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Pubmed Import
 
Versions
Version Filter Type
Citation counts: Google Scholar Search Google Scholar
Created: Wed, 09 May 2018, 10:09:35 EST