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Wachtel, Ellen
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Publications (7/7 displayed)
- 2024A Gd-doped ceria/TiOx nanocomposite as the active layer in a three terminal electrochemical resistivity switch.citations
- 2022C-Axis Textured, 2–3 μm Thick Al0.75Sc0.25N Films Grown on Chemically Formed TiN/Ti Seeding Layers for MEMS Applicationscitations
- 2019Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramicscitations
- 2017Self-supported Gd-doped ceria films for electromechanical actuationcitations
- 2012Influence of Gd content on the room temperature mechanical properties of Gd-doped ceriacitations
- 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
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document
Synthesis and properties of alkali metal intercalated fullerene-like MS2 (M=W,MO) nanoparticles
Abstract
Layered metal disulfides - MoS2 and WS2 in the form of fullerene-like (IF) 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 (EDS) and X-ray photoelectron spectroscopy (XPS). X-ray powder diffraction (XRD) analysis and transmission electron microscopy (TEM) 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 Angstrom) 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. The modifications in magnetic and transport properties of the intercalated materials were investigated, and are believed to occur via charge transfer from the alkali metal to the conduction band of the host lattice. Restacking of the MS2 layers after prolonged exposure to the atmosphere and recovery of the pristine compound properties were observed as a result of deintercalation of the metal atoms.