Straightforward identification of monolayer WS2 structures by Raman spectroscopy

Barbosa, A.N.; Figueroa, Neileth S.; Giarola, Marco; Mariotto, G.; Freire, F.L.

doi:10.1016/j.matchemphys.2019.122599

Cited by 23 publications

(8 citation statements)

References 20 publications

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“…The A 1g mode (417.7 cm −1 ) represents out-of-plane vibration and E 1 2g (351.44 cm −1 ) represents in-plane vibration mode. 25–27 The presence of these signature modes confirms the formation of WS 2 . Monolayer WS 2 is a semiconductor with a band-gap in the visible range (∼2 eV), while few-layer WS 2 shows an indirect band-gap.…”

Section: Resultsmentioning

confidence: 72%

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Sharma

Viswanath

Vaish

2022

Environ. Sci.: Nano

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Section: Resultsmentioning

confidence: 72%

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Sharma

Viswanath

Vaish

2022

Environ. Sci.: Nano

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“…The double-resonance scattering could be the spectral fingerprint of the WS 2 monolayer. 40 The intensity of the 2LA(M) mode is increased in the exfoliated WS 2 compared with that of the bulk; therefore the 2LA(M) mode slightly depends on the layer thickness. The A 1g (Γ) mode undergoes a blue shift with increasing layer number, showing a lattice stiffening effect as expected when additional layers are added in the case of the WS 2 -2D decagonal QC heterostructure.…”

Section: Resultsmentioning

confidence: 95%

“…The two modes at ∼350 and ∼420 cm –1 are in-plane 2LA(M) and the out-of-plane A 1g (Γ) vibrational modes, which are polarization-sensitive, and hence the excitation laser line was tuned to an unpolarized state. The double-resonance scattering could be the spectral fingerprint of the WS 2 monolayer . The intensity of the 2LA(M) mode is increased in the exfoliated WS 2 compared with that of the bulk; therefore the 2LA(M) mode slightly depends on the layer thickness.…”

Section: Results and Discussionmentioning

confidence: 99%

Extraction of Two-Dimensional Aluminum Alloys from Decagonal Quasicrystals

et al. 2020

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Atomically thin metallic alloys are receiving increased attention due to their prospective applications as interconnects/contacts in two-dimensional (2D) circuits, sensors, and catalysts, among others. In this work, we demonstrate an easily scalable technique for the synthesis of 2D metallic alloys from their 3D quasicrystalline precursors. We have used aluminum (Al)-based single-phase decagonal quasicrystal Al66Co17Cu17 alloy to extract the corresponding 2D alloy structure. The 2D layered Al alloy possesses 2-fold decagonal quasicrystalline symmetry and consists of two- or three-layer-thick sheets with a lateral dimension of microns. These 2D metallic layers were combined with the atomic layers of tungsten disulfide to form the stacked heterostructures, which is demonstrated to be a stable and efficient catalyst for hydrogen evolution reaction.

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“…The first and higher order modes are observed in both spectra due to the resonance excitation with the 633 nm laser [38,39] Peak positions are presented in Tables S1 and S2 (Supporting Information) and the corresponding modes are assigned according to literature. [38][39][40][41][42][43] The WS 2 peak 350 cm -1 is assigned to 2LA, because of the resonant conditions, it is more intense than the E 1 2 g mode. The most intense peak, situated at 412 cm -1 is assigned to the A 1g mode, as the point group symmetry (D 6h ) of the alloyed material should be the same as for MoS 2 and WS 2 .…”

Section: Resultsmentioning

confidence: 99%

Mo_xW_x–1S₂ Nanotubes for Advanced Field Emission Application

Pirker

Ławrowski

Schreiner

et al. 2023

Adv Funct Materials

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Transition metal dichalcogenide (TMDC) nanotubes complement the field of low‐dimensional materials with their quasi‐1D morphology and a wide set of intriguing properties. By introducing different transition metals into the crystal structure, their properties can be tailored for specific purpose and applications. Herein, the characterization and a subsequent preparation of single‐nanotube field emission devices of MoxWx‐1S2 nanotubes prepared via the chemical vapor transport reaction is presented. Energy‐dispersive X‐ray spectroscopy, Raman spectroscopy, and X‐ray diffraction indicate that the molybdenum and tungsten atoms are randomly distributed within the crystal structure and that the material is highly crystalline. High resolution transmission electron microscopy and electron diffraction (ED) patterns further corroborate these findings. A detailed analysis of the ED patterns from an eight‐layer nanotube reveal that the nanotubes grow in the 2H structure, with each shell consists of one bilayer. The work function of the nanotubes is comparable to that of pure MoS2 and lower of pure WS2 NTs, making them ideal candidates for field emission applications. Two devices with different geometrical setup are prepared and tested as field emitters, showing promising results for single nanotube field emission applications.

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Straightforward identification of monolayer WS2 structures by Raman spectroscopy

Cited by 23 publications

References 20 publications

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Extraction of Two-Dimensional Aluminum Alloys from Decagonal Quasicrystals

Mo_xW_x–1S₂ Nanotubes for Advanced Field Emission Application

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Straightforward identification of monolayer WS2 structures by Raman spectroscopy

Cited by 23 publications

References 20 publications

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS2 on sapphire substrate

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS2 on sapphire substrate

Extraction of Two-Dimensional Aluminum Alloys from Decagonal Quasicrystals

MoxWx–1S2 Nanotubes for Advanced Field Emission Application

Contact Info

Product

Resources

About

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Reusable piezocatalytic water disinfection activity of CVD-grown few-layer WS₂ on sapphire substrate

Mo_xW_x–1S₂ Nanotubes for Advanced Field Emission Application