Transformation of monolayer MoS2 into multiphasic MoTe2: Chalcogen atom-exchange synthesis route

Fang, Qiyi; Zhang, Zhepeng; Ji, Qingqing; Zhu, Siya; Gong, Yue; Shi, Jianping; Zhou, Xinyu; Gu, Lin; Wang, Qian; Zhang, Yanfeng

doi:10.1007/s12274-017-1480-z

Cited by 15 publications

(13 citation statements)

References 46 publications

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“…183 A reliable transition process is the key point to implement this method, and the possibility of the reaction can be judged by thermodynamic evaluation. The sulfurization, 181,182 selenization, 184 and tellurization 185 of Mo-based TMDs are reported, confirming the feasibility of preparing heterostructures based on MoS 2 , MoSe 2 and MoTe 2 through the partial transition strategy. The difficulty of this preparation method lies in maintaining the in-plane uniformity during the transition, which can be guaranteed during the metal-organic chemical vapor deposition 128 and vertical chemical vapor deposition (VCVD) 69 process.…”

Section: Discussionsupporting

confidence: 55%

Wafer‐scale vertical van der Waals heterostructures

Liu

Zhai

2020

InfoMat

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Wafer‐scale van der Waals heterostructures (vdWHs), benefitting from the rich diversity in materials available and stacking geometry, precise controllability in devices structure and performance, and unprecedented potential in practical application, have attracted considerable attention in the field of two‐dimensional (2D) materials. This article reviews the state‐of‐the‐art research activities that focus on wafer‐scale vdWHs and their (opto)electronic applications. We begin with the preparation strategies of vdWHs with wafer size and illustrate them from four key aspects, that is, mechanical‐assembly stack, successive deposition, synchronous evolution, and seeded growth. We discuss the fundamental principle, underlying mechanism, advantages, and disadvantages for each strategy. We will then review the applications of large‐area vdWHs based devices in electronic, optoelectronic and flexible devices field, unveiling their promising potential for practical application. Ultimately, we will demonstrate the challenges they face and provide some viable solutions on wafer‐scale heterostructure synthesis and device fabrication.

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Section: Discussionsupporting

confidence: 55%

Wafer‐scale vertical van der Waals heterostructures

Liu

Zhai

2020

InfoMat

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“…8 Here we propose to achieve a stable high-density dispersion of heteroatoms by incorporating them individually into the crystal structure of TMC single layers. This approach relies on the susceptibility of TMC crystals for chalcogenide atom exchange, 9 which makes them a good candidate for hosting substitutional heteroatoms. However, TMCs not only are a promising support but also can catalyze various reactions on their own, such as hydrogen evolution or hydrodesulfurization.…”

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confidence: 99%

“…This has been demonstrated for the O substitution reaction of MoS 2 under ambient conditions, as well as the Te substitution of S atoms, transforming MoS 2 into MoTe 2 . 9…”

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confidence: 99%

“…We propose that this can be realized through substituting single atoms of the TMC basal plane with the desired heteroatoms. In the case of TMC crystals, this is facilitated by their susceptibility for chalcogenide atom exchange, making them a good candidate for hosting substitutional single heteroatoms. This approach resembles the case of single-atom alloy catalysts formed by individual metal atoms with a different metal substrate. , …”

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confidence: 99%

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Transition Metal Chalcogenide Single Layers as an Active Platform for Single-Atom Catalysis

et al. 2019

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Among the main appeals of single-atom catalysts are the ultimate efficiency of material utilization and the well-defined nature of the active sites, holding the promise of rational catalyst design. A major challenge is the stable decoration of various substrates with a high density of individually dispersed and uniformly active monatomic sites. Transition metal chalcogenides (TMCs) are broadly investigated catalysts, limited by the relative inertness of their pristine basal plane. We propose that TMC single layers modified by substitutional heteroatoms can harvest the synergistic benefits of stably anchored single-atom catalysts and activated TMC basal planes. These solid-solution TMC catalysts offer advantages such as simple and versatile synthesis, unmatched active site density, and a stable and well-defined single-atom active site chemical environment. The unique features of heteroatom-doped two-dimensional TMC crystals at the origin of their catalytic activity are discussed through the examples of various TMC single layers doped with individual oxygen heteroatoms.

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“…[ 10–12 ] However, the intrinsic semiconducting characteristics of MoS 2(1− x ) Se 2 x alloys greatly hamper the charge transport during HER. Compared with Se, doping MoS 2 with tellurium (Te) by substitution can tune the properties of MoS 2 more dramatically, [ 13 ] and it also holds the potential for phase engineering of MoS 2 , [ 14,15 ] which will accelerate charge transport process by improving the conductivity of catalysts. Also, the catalytic properties of MoS 2(1− x ) Te 2 x alloys are rarely explored.…”

Section: Figurementioning

confidence: 99%

1D/2D Heterostructures as Ultrathin Catalysts for Hydrogen Evolution Reaction

Ping

Lü

et al. 2020

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2D MoS2 has emerged as a promising alternative to Pt‐based catalysts for hydrogen evolution reaction (HER) due to its low cost and earth abundance. However, insufficient active sites of basal plane and poor conductivity become the foremost factors restricting the catalytic performance of MoS2. Here, a facile strategy is presented to enhance the HER performance of MoS2 by converting its 2D structure into 1D/2D heterostructures of Mo6Te6/MoS2(1−x)Te2x by the in situ tellurization. As‐prepared 1D/2D heterostructures exhibit excellent HER performance with the Tafel slope of ≈56 mV dec−1 (only one‐third of that for pristine MoS2). The enhanced HER catalytic activity is attributed to more Te/S vacancies introduced by tellurization, which serve as the active sites as suggested by theoretical calculations. Besides, the formation of highly conductive well‐aligned quasi‐1D Mo6Te6 nanobelts facilitate charge transport in HER. Previous work provides a facile approach to construct mixed dimensional materials, and opens up a new avenue to the properties modulation of 2D transition metal chalcogenides.

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Transformation of monolayer MoS2 into multiphasic MoTe2: Chalcogen atom-exchange synthesis route

Cited by 15 publications

References 46 publications

Wafer‐scale vertical van der Waals heterostructures

Wafer‐scale vertical van der Waals heterostructures

Transition Metal Chalcogenide Single Layers as an Active Platform for Single-Atom Catalysis

1D/2D Heterostructures as Ultrathin Catalysts for Hydrogen Evolution Reaction

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