A5069424768- 2D Materials and Applications
- MXene and MAX Phase Materials
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Boron and Carbon Nanomaterials Research
- Electrocatalysts for Energy Conversion
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Fullerene Chemistry and Applications
- Advanced Photocatalysis Techniques
- Nanowire Synthesis and Applications
- Tribology and Wear Analysis
- Gas Sensing Nanomaterials and Sensors
- biodegradable polymer synthesis and properties
- Hydrogen Storage and Materials
- Lubricants and Their Additives
- Conducting polymers and applications
- Carbon Nanotubes in Composites
- Liquid Crystal Research Advancements
- Advancements in Battery Materials
- Metal and Thin Film Mechanics
- Synthesis and properties of polymers
- Transition Metal Oxide Nanomaterials
- Electrospun Nanofibers in Biomedical Applications
- Catalysis and Hydrodesulfurization Studies
Holon Institute of Technology
2016-2025
Ben-Gurion University of the Negev
2024
Weizmann Institute of Science
2007-2023
University of Milan
2023
University of Warwick
2023
Newcastle University
2023
State Optical Institute named after SI Vavilov
2023
Vilnius University
2018
Chalmers University of Technology
2015
Peking University
2012
Abstract Chirality of materials are known to affect optical, magnetic and electric properties, causing a variety nontrivial phenomena such as circular dichiroism for chiral molecules, Skyrmions in magnets nonreciprocal carrier transport conductors. On the other hand, effect chirality on superconducting has not been known. Here we report nonreciprocity superconductivity—unambiguous evidence superconductivity reflecting structure which forward backward supercurrent flows equivalent because...
Layered metal disulfides-MS(2) (M = Mo, W) in the form of fullerene-like nanoparticles and platelets (crystallites 2H polytype) have been intercalated by exposure to alkali (potassium sodium) vapor using a two-zone transport method. The composition systems was established X-ray energy dispersive spectrometer photoelectron spectroscopy (XPS). concentration host lattice found depend on kind sample experimental conditions. Furthermore, an inhomogeneity samples observed. product consisted both...
The growth mechanism of WS 2 nanotubes in the large-scale fluidized-bed reactor is studied greater detail. This study and careful parameterization conditions within lead to synthesis large amounts (50–100 g/batch) pure nanotubes, which appear as a fluffy powder, (400–500 nanotubes/nanoplatelets mixture (50:50), where usually coming bundles. two products are obtained simultaneously same reaction but collected different zones reactor, reproducible fashion. characterization grow catalyst-free,...
We propose that a photodetector based on nanotubes formed from layered structure may have faster response than nanowires or nanobelts. The compound tungsten disulfide (WS2) can absorb visible and near-infrared lights. fabricated photodetectors individual WS2 nanotubes. exhibited remarkable to excitation with 633 785 nm light. nanotube-based short rise decay times of few hundred μs, high on/off ratio, spectral responsivity external quantum efficiency. Our results imply are prospective...
The relationship between structure and properties has been followed for different nanoscale forms of tungsten disulfide (2H-WS2) namely exfoliated monolayer few-layer nanoplatelets, nanotubes. similarities differences these nanostructured materials have examined using a combination optical microscopy, scanning high-resolution transmission electron microscopy atomic force microscopy. Photoluminescence Raman spectroscopy also used to distinguish material. Strain induced phonon shifts from the...
This study solves a more than two-decades-long "MoS2 Nanotubes" synthetic enigma: the futile attempts to synthesize inorganic nanotubes (INTs) of MoS2via vapor-gas-solid (VGS) reaction. Among them was replication recently reported pure-phase synthesis analogous INT-WS2. During these years, successful syntheses spherical nanoparticles WS2 and MoS2 were demonstrated as well. All nanostructures obtained by VGS reaction corresponding oxides with H2/H2S gases, at elevated temperatures (>800 °C),...
The synthesis of high-quality WS2 and more so MoS2 (multiwall) nanotubes in substantial amounts from oxide precursors is a very challenging important undertaking. While progress has been offered by recent report, the present work presents another step forward with narrow size distribution better crystallinity than before. Williamson–Hall analysis X-ray diffraction data used to analyze strain nanotubes. This shows that average diameter reported here (type II) are those obtained according...
Intelligent materials with adaptive response to external stimulation lay foundation integrate functional systems at the material level. Here, experimental observation and numerical simulation, we report a delicate nano-electro-mechanical-opto-system naturally embedded in individual multiwall tungsten disulfide nanotubes, which generates distinct form of in-plane van der Waals sliding ferroelectricity from unique combination superlubricity piezoelectricity. The enables programmable...
Inorganic fullerene-like (hollow onionlike) nanoparticles (IF) and nanotubes have attracted considerable interest in recent years, due to their unusual crystallographic morphology interesting physical properties. IF-MoS2 were first synthesized by a gas-phase reaction from MoO3 powder. This process consists of three steps: (1) evaporation the powder as molecular clusters; (2) condensation oxide clusters give MoO3-x nanosize particles; (3) sulfidization suboxide generate IF nanoparticles. The...
Tungsten disulfide inorganic nanotubes (WS2 INTs), which are available now in large amounts, were embedded into a poly methyl methacrylate (PMMA) nanofiber matrix. The PMMA solution and PMMA–WS2 INT suspensions electrospun to form aligned meshes. TEM analysis revealed that WS2 INTs well dispersed within the fiber matrix along axes. Characteristic Raman signatures of observed for composite characteristic optical absorption band shifted blue wavelength region presence PMMA, shift indicating...
This study reports the electrical transport and field emission properties of individual multi-walled tungsten disulphide (WS2 ) nanotubes (NTs) under electron beam irradiation mechanical stress. Electron is used to reduce nanotube-electrode contact resistance by one-order magnitude. The capability single WS2 NTs investigated, a current density as high 600 kA cm-2 attained with turn-on ≈100 V μm-1 field-enhancement factor ≈50. Moreover, behavior studied application longitudinal tensile An...
Abstract The growth mechanism of WS2 nanotubes is briefly discussed. Two distinct mechanisms can be delineated, leading to somewhat different products: 1) thick (50–150 nm) and very long (20–50 microns above) consisting many (>20) layers, 2) slender (20–25 with 5–10 layers. synthesis large amounts pure belonging the first category in large-scale fluidized-bed reactor described. Characterization nanotubes, which grow catalyst-free by a number analytical techniques, reported. reveal highly...
Impaired salivary gland (SG) function leading to oral diseases is relatively common with no adequate solution. Previously, tissue engineering of SG had been proposed overcome this morbidity, however, not yet clinically available. Multiwall inorganic (tungsten disulfide [WS2]) nanotubes (INT-WS2) and fullerene-like nanoparticles (IF-WS2) have many potential medical applications. A unexplored venue application their interaction SG, therefore, our aim was test the biocompatibility INT/IF-WS2 A5...
Due to their favourable and rich electronic optical properties, group-VI-B transition-metal dichalcogenides (TMDs) have attracted considerable interest. They earned position in the materials portfolio of spintronics valleytronics communities. The electrical performance TMDs is enhanced by rolling up two-dimensional (2D) sheets form quasi-one-dimensional (1D) tubular structures. fabrication p-n junctions out these would boost potential for optoelectronic devices as such represent a...
Even though WS2 nanotubes (NTs-WS2) have great potential as anode materials for lithium-ion batteries (LIBs) and sodium-ion (SIBs) thanks to their unusual layered structure, conductivity cycling stability are far from satisfactory. To tackle these issues, carbon-coated (NTs-WS2@C) nanocomposites were prepared through a facile synthesis method that involved precipitating carbon precursor (20% sucrose) on nanotubes, followed by annealing treatment under an argon environment. Thanks the...
The electrical properties of WS2 nanotubes (NTs) were studied through measuring 59 devices. Important parameters, such as the carrier concentration, mobility, and effective barrier height at contacts, obtained fitting experimental non-linear I-V curves using a metal-semiconductor-metal model. mobility was found to be several orders magnitude higher than that have been reported previously for NTs. Water absorption decrease conductivity NTs, could removed when sample dried. Oxygen also...
Results on electron field emission from free standing tungsten disulfide (WS 2 ) nanotubes (NTs) are presented. Experiments show that the NTs protruding top of microstructures efficient cold emitters with turn‐on fields as low 1 V/μm and enhancement few thousands. Furthermore, current shows remarkable stability over more than eighteen hours continuous operation. Such performance long‐term WS cathodes is comparable to reported for optimized carbon nanotube (CNTs) based emitters. Besides this,...
Tungsten oxide/tungsten sulfide (W<sub>18</sub>O<sub>49</sub>@WS<sub>2</sub>) core–shell nanorods prepared <italic>via</italic> controlled sulfidization reaction of W<sub>18</sub>O<sub>49</sub> nanowhiskers showed hydrogen evolution (HER) activity superior to WS<sub>2</sub> nanotubes, indicating the critical role a highly conductive oxide core in enhancing HER activity.
Resonance Raman profiles of WS${}_{2}$ nanotubes different diameter are presented. We show that the A excitonic transition energy lies below bulk value and is increasingly redshifted with decreasing nanotubes. The findings attributed to strain effects associated curvature nanotube walls. silent mode, ${B}_{1u}$ disorder enhanced in spectra nanomaterials. discuss development relative intensities mode nearby ${A}_{1g}$ diameter, excitation energy, hydrostatic pressure terms a slight difference...
Nanocomposites formed by carboxyl-functionalized MoS2 nanotubes with poly(diallyldimethylammonium chloride) (PDDA, described as P)-modified single-walled carbon (SWCNT) and borocarbonitride (BCNNT) have been prepared a solution-phase flocculation of 1D nanotubes. The nanocomposites show higher photocatalytic electrocatalytic HER activities compare to the individual constituents, where H2 yield improves nanotube proportion. maximum evolution rate achieved is 7475 μmol g–1 h–1 in nanocomposite...