| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bangert, Ursel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectriccitations
- 2024Observation of antiferroelectric domain walls in a uniaxial hyperferroelectriccitations
- 2024Observation of antiferroelectric domain walls in a uniaxial hyperferroelectriccitations
- 2024Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectric.citations
- 2022Understanding and Controlling the Evolution of Nanomorphology and Crystallinity of Organic Bulk‐Heterojunction Blends with Solvent Vapor Annealingcitations
- 2018Local Plasmon Engineering in Doped Graphenecitations
- 2017Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubescitations
- 2016Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubescitations
- 2012Interaction of metals with suspended graphene observed by transmission electron microscopycitations
- 2012Probing the bonding and electronic structure of single atom dopants in graphene with electron energy loss spectroscopycitations
- 2011Controlled synthesis of tuned bandgap nanodimensional alloys of PbS xSe1-xcitations
- 2008Electron energy loss spectroscopy on alkylated silicon nanocrystalscitations
- 2007Investigating large vacancy clusters in type IIa diamond with electron energy loss spectroscopy (EELS)citations
- 2006Structure and composition of nanoscopic domains in functional perovskite-type materialscitations
- 2006Structure and Composition of Nanoscopic Domains in Functional Perovskite-Type Materialscitations
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article
Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubes
Abstract
The relationship between structure and properties has been followed for different nanoscale forms of tungsten disulfide (2H-WS2) namely exfoliated monolayer and few-layer nanoplatelets, and nanotubes. The similarities and differences between these nanostructured materials have been examined using a combination of optical microscopy, scanning and high-resolution transmission electron microscopy (SEM and HRTEM) and atomic force microscopy (AFM). Photoluminescence (PL) and Raman spectroscopy have also been used to distinguish between monolayer and few-layer material. Strain induced phonon shifts have been followed from the changes in the positions of the A1g and E2g1 Raman bands during uniaxial deformation. This has been modelled for monolayer using density functional theory (DFT) with excellent agreement between the measured and predicted behaviour. It has been found that as the number of WS2 layers increases for few-layer crystals or nanotubes, the A1g mode hardens whereas the E2g1 mode softens. This is believed to be due to the A1g mode, which involves out of plane atomic movements, being constrained by the increasing number of WS2 layers whereas easy sliding reduces stress transfer to the individual layers for the E2g1 mode, involving only in-plane vibrations. This finding has enabled the anomalous phonon shift behaviour in earlier pressure measurements on WS2 to be resolved, as well as similar effects in other transition metal dichalcogenides, such as molybdenum disulfide (MoS2), to be explained.