Single‐Crystalline Nanobelts Composed of Transition Metal Ditellurides

Kwak, Jinsung; Jo, Yongsu; Song, Seunguk; Kim, Jung Hwa; Kim, Se Yang; Lee, Jae-Ung; Lee, Sung‐Woo; Park, Jungmin; Kim, Kangwon; Lee, Gun-Do; Yoo, Jung Woo; Kim, Sung Youb; Kong, Young Min; Lee, Gwan Hyoung; Lee, Wan Gyu; Park, Jucheol; Xu, Xiaodong; Cheong, Hyeonsik; Yoon, Euijoon; Lee, Zonghoon; Kwon, Soon Yong

doi:10.1002/adma.201707260

Cited by 21 publications

(29 citation statements)

References 52 publications

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“…These results correlate well with the previously published reports for a similar system in the work of Kwak et al [47]. However, a notable difference is that if one looks at a cross-section SEM of the films in this work, shown in Fig.…”

Section: Wte 2 Growth Mechanismsupporting

confidence: 93%

“…This shows very clear atomic resolution giving the expected T d structure of WTe 2 . This matches well to the previously published analysis of WTe 2 [4,47].…”

Section: Characterising Individual Nanobeltssupporting

confidence: 92%

“…3d, it is clear that the droplets were raised above the majority of the surface and that the WTe 2 crystals grew within them. This suggests that W tends to dissolve into Te rather than Te etching down into the W, as proposed in the previous work [47].…”

Section: Wte 2 Growth Mechanismsupporting

confidence: 71%

“…This causes a CuTe x alloy to form, in which WTe 2 grows. Following this a post-growth etch is needed to remove residual CuTe x [47]. The synthesis method in this work is more straight-forward and does not require a post-growth etch offering a potential advantage.…”

Section: Electrical Characterisationmentioning

confidence: 99%

“…Large-area growth of polycrystalline films of WTe 2 has been achieved, with thicknesses ranging from a few to tens of monolayers [41,43,46,47]. These films are generally synthesised by the conversion of a pre-deposited W source on a substrate.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of tungsten ditelluride thin films and highly crystalline nanobelts from pre-deposited reactants

et al. 2020

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Tungsten ditelluride (WTe 2) is a layered transition metal dichalcogenide (TMD) that has attracted increasing research interest in recent years. WTe 2 has demonstrated large non-saturating magnetoresistance, potential for spintronic applications and promise as a type-II Weyl semimetal. The majority of works on WTe 2 have relied on mechanically exfoliated flakes from chemical vapour transport (CVT)-grown crystals for their investigations. While producing high-quality samples, this method is hindered by several disadvantages including long synthesis time, high-temperature annealing and an inherent lack of scalability. In this work, a synthesis method is demonstrated that allows the production of large-area polycrystalline films of WTe 2. This is achieved by the reaction of pre-deposited films of W and Te at a relatively low temperature of 550 °C. Sputter X-ray photoelectron spectroscopy reveals the rapid but self-limiting nature of the oxidation of these WTe 2 films in ambient conditions. The WTe 2 films are composed of areas of micrometre-sized nanobelts that can be isolated and offer potential as an alternative to CVT-grown samples. These nanobelts are highly crystalline with low defect densities indicated by transmission electron microscopy and show promising initial electrical results.

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Section: Wte 2 Growth Mechanismsupporting

confidence: 93%

“…This shows very clear atomic resolution giving the expected T d structure of WTe 2 . This matches well to the previously published analysis of WTe 2 [4,47].…”

Section: Characterising Individual Nanobeltssupporting

confidence: 92%

Section: Wte 2 Growth Mechanismsupporting

confidence: 71%

Section: Electrical Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of tungsten ditelluride thin films and highly crystalline nanobelts from pre-deposited reactants

et al. 2020

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Design of 2D Layered Catalyst by Coherent Heteroepitaxial Conversion for Robust Hydrogen Generation

Sim

Yoon

Kang

et al. 2020

Adv Funct Materials

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The structural engineering of 2D layered materials is emerging as a powerful strategy to design catalysts for high‐performance hydrogen evolution reaction (HER). However, the ultimate test of this technology under typical operating settings lies in the reduced performance and the shortened lifespan of these catalysts. Here, a novel approach is proposed to design efficient and robust HER catalysts through out‐of‐plane deformation of 2D heterojunction using metal‐organic chemical vapor deposition. High‐yield, single‐crystalline WTe2 nanobelts are used as an epitaxial template for their coherent conversion to WS2. During the conversion process, the WTe2/WS2 heterostructure containing both lateral and vertical junctions are achieved by coherent heteroepitaxial stacking despite differences in symmetry. The lattice coherency drives out‐of‐plane deformation of heteroepitaxially grown WS2. The increase in the effective surface area and decrease in the electron‐transfer resistance across the 2D heterojunctions in turn enhances the HER performance as well as the long‐term durability of these electrocatalysts.

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Recent Developments in Controlled Vapor‐Phase Growth of 2D Group 6 Transition Metal Dichalcogenides

et al. 2019

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An overview of recent developments in controlled vapor-phase growth of two-dimensional transition metal dichalcogenide (2D TMD) films is presented. Investigations of thin-film formation mechanisms and strategies for realizing 2D TMD films with less-defective large domains are of central importance because single-crystal-like 2D TMDs exhibit the most beneficial electronic and optoelectronic properties. The focus is on the role of the various This article is protected by copyright. All rights reserved. growth parameters, including strategies for efficiently delivering the precursors, the selection and preparation of the substrate surface as a growth assistant, and the introduction of growth promoters (e.g., organic molecules and alkali metal halides) to facilitate the layered growth of (Mo, W)(S, Se, Te) 2 atomic crystals on inert substrates. Critical factors governing the thermodynamic and kinetic factors related to chemical reaction pathways and the growth mechanism are reviewed. With modification of classical nucleation theory, strategies for designing and growing various vertical/lateral TMD-based heterostructures are discussed.Then, several pioneering techniques for facile observation of structural defects in TMDs, which substantially degrade the properties of macro-scale TMDs, are introduced. Technical challenges to be overcome and future research directions in the vapor-phase growth of 2D TMDs for heterojunction devices are discussed in light of recent advances in the field.

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Single‐Crystalline Nanobelts Composed of Transition Metal Ditellurides

Cited by 21 publications

References 52 publications

Synthesis of tungsten ditelluride thin films and highly crystalline nanobelts from pre-deposited reactants

Synthesis of tungsten ditelluride thin films and highly crystalline nanobelts from pre-deposited reactants

Design of 2D Layered Catalyst by Coherent Heteroepitaxial Conversion for Robust Hydrogen Generation

Recent Developments in Controlled Vapor‐Phase Growth of 2D Group 6 Transition Metal Dichalcogenides

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