Combined spectroscopy and microscopy of supported MoS2 nanoparticles

Nielsen, Linda; Bech, Lone; Agersted, Karsten; Tison, Yann; Jørgensen, Kristina Pilt; Bonde, Jacob Lindner; Horch, Sebastian; Jaramillo, Thomas F.; Chorkendorff, Ib

doi:10.1016/j.susc.2009.02.039

Cited by 33 publications

(44 citation statements)

References 33 publications

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“…Distinguishable triangular MoS 2 crystal fragments were clearly observed on the Au(111) surface. Orientation statistics analysis showed that MoS 2 fragments were preferentially arranged as observed in a previous study, reflecting threefold symmetry of the MoS 2 and unreconstructed Au(111) lattices (Figure d) . Monolayer MoSe 2 on Au(111) (MoSe 2 /Au(111)) was also synthesized, and the well‐defined crystalline growth was achieved.…”

Section: Resultssupporting

confidence: 72%

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Yasuda

Takahashi

Osaka

et al. 2017

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Making contact of transition metal dichalcogenides (TMDCs) with a metal surface is essential for fabricating and designing electronic devices and catalytic systems. It also generates strain in the TMDCs that plays significant role in both electronic and phonon structures. Therefore, detailed understanding of mechanism of the strain generation is important to fully comprehend the modulation effect for the electronic and phonon properties. Here, MoS and MoSe monolayers are grown on Au surface by chemical vapor deposition and it is demonstrated that the contact with a crystalline Au(111) surface gives rise to only out-of-plane strain in both MoS and MoSe layers, whereas no strain generation is observed on polycrystalline Au or SiO /Si surfaces. Scanning tunneling microscopy analysis provides information regarding consequent specific adsorption sites between lower S (Se) atoms in the SMoS (SeMoSe) structure and Au atoms via unique moiré superstructure formation for MoS and MoSe layers on Au(111). This observation indicates that the specific adsorption sites give rise to out-of-plane strain in the TMDC layers. Furthermore, it also leads to effective modulation of the electronic structure of the MoS or MoSe layer.

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Section: Resultssupporting

confidence: 72%

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Yasuda

Takahashi

Osaka

et al. 2017

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“…The higher crystallinity of these samples is an important factor when evaluating their electrocatalytic activity for HER, since crystallinity affects the formation of well-defined active edge sites. [18] The absence of the (002) reflection in all six IL-synthesised samples suggests that the MoS 2 layers do not stack to a signifi-cant height, and that stacks do not appear frequently in the sample. The nanometre-scale arrangement of the MoS 2 layers and bulk morphology of these six samples were analysed by TEM and SEM (Figures 5 and 6, respectively).…”

Section: Resultsmentioning

confidence: 93%

Ionic‐Liquid‐Mediated Active‐Site Control of MoS₂ for the Electrocatalytic Hydrogen Evolution Reaction

Lau

Masters

Bond

et al. 2012

Chemistry A European J

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The layered crystal MoS(2) has been proposed as an alternative to noble metals as the electrocatalyst for the hydrogen evolution reaction (HER). However, the activity of this catalyst is limited by the number of available edge sites. It was previously shown that, by using an imidazolium ionic liquid as synthesis medium, nanometre-size crystal layers of MoS(2) can be prepared which exhibit a very high number of active edge sites as well as a de-layered morphology, both of which contribute to HER electrocatalytic activity. Herein, it is examined how to control these features synthetically by using a range of ionic liquids as synthesis media. Non-coordinating ILs with a planar heterocyclic cation produced MoS(2) with the de-layered morphology, which was subsequently shown to be highly advantageous for HER electrocatalytic activity. The results furthermore suggest that the crystallinity, and in turn the catalytic activity, of the MoS(2) layers can be improved by employing an IL with specific solvation properties. These results provide the basis for a synthetic strategy for increasing the HER electrocatalytic activity of MoS(2) by tuning its crystal properties, and thus improving its potential for use in hydrogen production technologies.

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“…A possible rationale for the detrimental effect of a long alkyl substituent is that the increased steric effect hindered the stabilising interactions of the ionic liquids, which thus results in some loss of the active edges. [19] This factor differentiates samples 1 and 2 from sample 3, which, as can be observed in Figures 3 and 4, was mainly amorphous and possessed ill-defined (100) and (110) intralayer reflections. [18] The second feature of the ionic liquid-based synthesis is that the formation of crystalline MoS 2 with well-defined edges is facilitated, a prerequisite for highly active catalysts.…”

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confidence: 83%

“…[18] The second feature of the ionic liquid-based synthesis is that the formation of crystalline MoS 2 with well-defined edges is facilitated, a prerequisite for highly active catalysts. [19] This factor differentiates samples 1 and 2 from sample 3, which, as can be observed in Figures 3 and 4, was mainly amorphous and possessed ill-defined (100) and (110) intralayer reflections. Despite its high BET surface area, the lack of well-defined edge sites in sample 3 proved to be detrimental to both its electrocatalytic activity, as shown in Figure 1 to be even lower than GCE, and its electrical conductivity, as evident by its low electrochemical surface area in Table S1 (see the Supporting Information).…”

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confidence: 83%

Promoting the Formation of Active Sites with Ionic Liquids: A Case Study of MoS₂ as Hydrogen‐Evolution‐Reaction Electrocatalyst

et al. 2011

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Combined spectroscopy and microscopy of supported MoS2 nanoparticles

Cited by 33 publications

References 33 publications

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Ionic‐Liquid‐Mediated Active‐Site Control of MoS₂ for the Electrocatalytic Hydrogen Evolution Reaction

Promoting the Formation of Active Sites with Ionic Liquids: A Case Study of MoS₂ as Hydrogen‐Evolution‐Reaction Electrocatalyst

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Combined spectroscopy and microscopy of supported MoS2 nanoparticles

Cited by 33 publications

References 33 publications

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS2 and MoSe2 on Au(111)

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS2 and MoSe2 on Au(111)

Ionic‐Liquid‐Mediated Active‐Site Control of MoS2 for the Electrocatalytic Hydrogen Evolution Reaction

Promoting the Formation of Active Sites with Ionic Liquids: A Case Study of MoS2 as Hydrogen‐Evolution‐Reaction Electrocatalyst

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Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Out‐of‐Plane Strain Induced in a Moiré Superstructure of Monolayer MoS₂ and MoSe₂ on Au(111)

Ionic‐Liquid‐Mediated Active‐Site Control of MoS₂ for the Electrocatalytic Hydrogen Evolution Reaction

Promoting the Formation of Active Sites with Ionic Liquids: A Case Study of MoS₂ as Hydrogen‐Evolution‐Reaction Electrocatalyst