| 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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Feldman, Yishai
Laboratori Guglielmo Marconi (Italy)
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2022Polymer Gel with Tunable Conductive Properties: A Material for Thermal Energy Harvesting
- 2021Calcium Sulfate Hemihydrate (Bassanite) Crystals in the Wood of the Tamarix Treecitations
- 2020Archaeological Ceramic Diagenesis: Clay Mineral Recrystallization in Sherds from a Late Byzantine Kiln, Israelcitations
- 2019A Nanoscopic View of Photoinduced Charge Transfer in Organic Nanocrystalline Heterojunctionscitations
- 2018Expanding the boundaries of metal depositioncitations
- 2017Real-time plasmon spectroscopy study of the solid-state oxidation and Kirkendall void formation in copper nanoparticlescitations
- 2013New deposition technique for metal films containing inorganic fullerene-like (IF) nanoparticlescitations
- 2011Alleviating fatigue and failure of NiTi endodontic files by a coating containing inorganic fullerene-like WS2 nanoparticlescitations
- 2008Fullerene-like Mo(W)1-xRexS2 nanoparticlescitations
- 2007Fabrication of self-lubricating cobalt coatings on metal surfacescitations
- 2004Non-crystalline pyroelectric BaTiO3 thin filmscitations
- 2003Solution-processed anodes from layer-structure materials for high-efficiency polymer light-emitting diodescitations
- 2003Evidences for dry deintercalation in layered compounds upon controlled surface charging in x-ray photoelectron spectroscopycitations
- 2002Synthesis and properties of alkali metal intercalated fullerene-like MS2 (M=W,MO) nanoparticles
- 2002Alkali metal intercalated fullerene-like MS2 (M = W, Mo) nanoparticles and their propertiescitations
Places of action
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article
Alkali metal intercalated fullerene-like MS2 (M = W, Mo) nanoparticles and their properties
Abstract
<p>Layered metal disulfides-MS<sub>2</sub> (M = Mo, W) in the form of fullerene-like nanoparticles and in the form of platelets (crystallites of the 2H polytype) have been intercalated by exposure to alkali metal (potassium and sodium) vapor using a two-zone transport method. The composition of the intercalated systems was established using X-ray energy dispersive spectrometer and X-ray photoelectron spectroscopy (XPS). The alkali metal concentration in the host lattice was found to depend on the kind of sample and the experimental conditions. Furthermore, an inhomogeneity of the intercalated samples was observed. The product consisted of both nonintercalated and intercalated phases. X-ray diffraction analysis and transmission electron microscopy of the samples, which were not exposed to the ambient atmosphere, showed that they suffered little change in their lattice parameters. On the other hand, after exposure to ambient atmosphere, substantial increase in the interplanar spacing (3-5 Å) was observed for the intercalated phases. Insertion of one to two water molecules per intercalated metal atom was suggested as a possible explanation for this large expansion along the c-axis. Deintercalation of the hydrated alkali atoms and restacking of the MS<sub>2</sub> layers was observed in all the samples after prolonged exposure to the atmosphere. Electric field induced deintercalation of the alkali metal atoms from the host lattice was also observed by means of the XPS technique. Magnetic moment measurements for all the samples indicate a diamagnetic to paramagnetic transition after intercalation. Measurements of the transport properties reveal a semiconductor to metal transition for the heavily K intercalated 2H-MOS<sub>2</sub>. Other samples show several orders of magnitude decrease in resistivity and two- to five-fold decrease in activation energies upon intercalation. These modifications are believed to occur via charge transfer from the alkali metal to the conduction band of the host lattice. Recovery of the pristine compound properties (diamagnetism and semiconductivity) was observed as a result of deintercalation.</p>