From bulk crystals to atomically thin layers of group VI-transition metal dichalcogenides vapour phase synthesis

Reale, Fabrizio; Sharda, Kanudha; Mattevi, Cecilia

doi:10.1016/j.apmt.2015.12.003

Cited by 75 publications

(36 citation statements)

References 93 publications

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“…If the growth temperature is too low, then S-precursors and WO 3 -precursors have a low surface diffusion rate and the adsorption energy is not sufficient [38,39]. Therefore, the obtained triangular and hexagonal WS 2 flakes are thicker and smaller as the temperature is decreased.…”

Section: Resultsmentioning

confidence: 99%

Controlled synthesis and mechanism of large-area WS2 flakes by low-pressure chemical vapor deposition

Wang

Meng

et al. 2017

J Mater Sci

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WS 2 flakes have been grown successfully on SiO 2 (300 nm)/Si substrate via traditional low-pressure chemical vapor deposition method. We studied the controllable growth of WS 2 flakes on three of the growth parameters: the time of S-precursor introduction, the temperature of WO 3 precursor and the growth temperature. The as-prepared products were characterized by X-ray photoemission spectroscopy, Raman spectra and atomic force microscopy. It is found that the morphologies of WS 2 flakes and the products are highly dependent on the concentration of S-precursor, W-precursor and the ratio of W atoms to S atoms, while large-area WS 2 flakes up to 160 lm can be obtained. If the ratio of W/S is B1:2, we obtain triangular and hexagonal WS 2 flakes. On the contrary, if the ratio of W/S is [1:2, besides WS 2 flakes, W nanowires will be formed owing to the superfluous W atoms. This study can provide an important and practical guide to preparing large-area and high-quality two-dimensional transition metal dichalcogenides materials.

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Section: Resultsmentioning

confidence: 99%

Controlled synthesis and mechanism of large-area WS2 flakes by low-pressure chemical vapor deposition

Wang

Meng

et al. 2017

J Mater Sci

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“…Therefore, deposition of a few layers of MoS 2 is highly desirable and could be particularly useful for various applications including hydrodesulfurization [9] and hydrogen evolution catalysis [3]. At present, there are several methods including electrochemistry, which have been proposed and reported for this purpose [10][11][12][13][14][15]. However, in most of these methods, MoS 2 deposition involves high temperature and pressure, non-aqueous solvents and other extreme conditions, which results in the production of amorphous and impure MoS 2 often intermixed with molybdenum oxide phases.…”

Section: Introductionmentioning

confidence: 99%

Ionic strength induced electrodeposition of two-dimensional layered MoS 2 nanosheets

Rastogi

Sarkar

Mandler

2017

Applied Materials Today

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“…Parameters (1)(2)(3) are reasonably well fulfilled in TMDs and their heterostructures. Moreover, it was demonstrated that 2H-MoS 2 features catalytic active edge sites for HER along the (10-10)-direction [32], while the (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)-direction undergoes an anodic corrosion limiting the functionalization as a photo-anode for the oxygen evolution reaction (OER) [32]. The two-dimensional character of TMDs further offers opportunities for structural and defect engineering to locally increase the catalytic activity and to create anchoring sites for co-catalysis.…”

Section: Introductionmentioning

confidence: 99%

“…The most efficient catalysts for the electrochemical hydrogen evolution reaction (HER) are rare and expensive noble metals such as Pt, with the electricity optionally delivered from solar cells [5]. In contrast, atomically thin, two-dimensional semiconducting transition metal dichalcogenides (TMDs), such as MoS 2 , offer the unique combination of a band gap in the visible range of about 1.9 eV for monolayers [6][7][8], high sunlight absorption of up to 15% [9][10][11], catalytically active sites for HER [4,[12][13][14][15][16] or CO 2 -reduction [17] and photocatalytic stability under harsh reaction conditions [18]. Moreover, semiconducting TMDs are earth abundant, inexpensive, and sustainable (photo-)catalysts which can be combined in lateral or vertical heterostructures [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen evolution activity of individual mono-, bi-, and few-layer MoS 2 towards photocatalysis

Parzinger

Mitterreiter

Stelzer

et al. 2017

Applied Materials Today

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b s t r a c tWe investigate the hydrogen evolution activity in the dark and under illumination above the band gap of individual mono-, bi-and few-layer (bulk) MoS 2 flakes. We demonstrate that the electrocatalytic activity of 2H-MoS 2 immersed in 1 M H 2 SO 4 increases with decreasing number of layers. For monolayers, we observe the highest exchange current density, which is one magnitude larger than in the bulk case. The onset potential scales with the number of layers, which is consistent with a previous report, suggesting that hopping transport across inter-layer barriers within the MoS 2 flakes is responsible for this scaling.A specially designed micro-sized catalytic cell enables us to investigate individual MoS 2 flakes with well-known geometry and edge-to-surface ratio. Taking these geometric parameters into account, we tentatively attribute the catalytic activity mainly to sulfur vacancies in the basal planes acting as active sites. The associated turn over frequencies (TOF) for mono-and bi-layer MoS 2 yield values higher than 10 3 s −1 at an overpotential of −0.2 V vs. RHE. In view of light driven hydrogen evolution as a means of solar energy conversion, we investigate the photocatalytic activity of few-layer MoS 2 under white light illumination.

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From bulk crystals to atomically thin layers of group VI-transition metal dichalcogenides vapour phase synthesis

Cited by 75 publications

References 93 publications

Controlled synthesis and mechanism of large-area WS2 flakes by low-pressure chemical vapor deposition

Controlled synthesis and mechanism of large-area WS2 flakes by low-pressure chemical vapor deposition

Ionic strength induced electrodeposition of two-dimensional layered MoS 2 nanosheets

Hydrogen evolution activity of individual mono-, bi-, and few-layer MoS 2 towards photocatalysis

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