The gas-phase reaction between MoO3-x and H(2)S in a reducing atmosphere at elevated temperatures (800 degrees to 950 C) has been used synthesize large quantities of an almost pure nested inorganic fullerene (IF) phase MoS(2). A uniform IF with relatively narrow size distribution was obtained. synthesis IFs appears require, addition careful control over the growth conditions, specific turbulent flow regime. x-ray spectra different samples show that, as average decreases, van der Waals gap...

We report the observation of single nanotube fragmentation, under tensile stresses, using nanotube-containing thin polymeric films. Similar fragmentation tests with fibers instead nanotubes are routinely performed to study fiber-matrix stress transfer ability in fiber composite materials, and thus efficiency quality interfaces. The multiwall nanotube-matrix is estimated be at least one order magnitude larger than conventional fiber-based composites.

Raman and resonance spectra of ${\mathrm{MoS}}_{2}$ nanoparticles, in the form inorganic fullerenelike nanoparticles with diameters ranging from 200 to 2000 \AA{} size, platelets 50 5000 are presented. Off resonance, first-order bands broadened, but not significantly shifted, no additional observed, indicating that atomic structure is preserved, at least locally, nanoparticles. The broadening effect assigned phonon confinement by facet boundaries. In several peaks observed. electron-phonon...

The phenomenon of a partial 2H→1T phase transition within multiwalled WS2 nanotubes under substitutional rhenium doping is discovered by means high-resolution transmission electron microscopy. Using density-functional tight-binding calculations for the related MoS2 compound, we consider possible origin this transition, which was known formerly only and intercalated alkali metals. An interplay between stability layered or nanotubular forms 2H 1T allotropes found to be intimately with their...

Nanoparticles of WS2 and MoS2 with a closed cage structure (fullerene-like) that are termed IF phases synthesized in large amounts pure form. These nanoparticles were shown to play favorable role as solid lubricants under severe conditions where fluids unable support the heavy load squeezed away from contact area. Various tribological scenarios presented for these superior lubricants, demonstrating scale potential applications materials. The mechanism action is briefly discussed. other...

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...

Recently, milligram quantities of MoS2 fullerene-like nanotubes and negative curvature polyhedra (generically called inorganic material, IF), were reproducibly obtained by a gas phase reaction from an oxide precursor (Feldman, Y.; Wasserman, E.; Srolovitz, D. J.; Tenne, R. Science 1995, 267, 222. Safran, S. A.; Homyonfer, M.; Phys. Rev. Lett. 74, 1778). The present work focuses on the mechanism synthesis IF-MS2 (M = W, Mo). IF material is particles smaller than ca. 0.2 μm, while larger...

Optical-absorption spectroscopy of inorganic fullerenelike ${\mathrm{MoS}}_{2}$ and ${\mathrm{WS}}_{2}$ (${\mathrm{I}\mathrm{F}\ensuremath{-}\mathrm{M}\mathrm{o}\mathrm{S}}_{2}$ ${\mathrm{I}\mathrm{F}\ensuremath{-}\mathrm{W}\mathrm{S}}_{2}$) is reported in the range 400--800 nm, at temperatures between 4--300 K, compared to corresponding bulk (2H) material. A systematic study effect IF size number atomic layers on optical properties shows that semiconductivity layered material preserved...

Abstract In analogy to graphite, nanoparticles of inorganic compounds with lamellar two‐dimensional structure, such as MoS 2 , are not stable against folding, and can adopt nanotubular fullerene‐like structures, nicknamed fullerenes or IF. Various applications for nanomaterials were proposed. For instance, IF‐WS shown have beneficial effects solid lubricants part tribological surfaces. Further IF high‐tensile‐strength fibers, hydrogen storage, rechargeable batteries, catalysis, in...

Using the paradigm of carbon fullerenes, it is shown that nanoparticles inorganic compounds with a layered structure, like MoS2, are unstable against bending and form hollow closed clusters, designated fullerene-like structures (IF). The analogy can be extended to similar nanostructures, nanotubes (NT), nested fullerenes negative curvature (Schwartzites), etc. Various synthetic routes described obtain isolated phases IF. Pentagons heptagons expected play primordial role in folding these...

The mechanical properties of materials and particularly the strength are greatly affected by presence defects; therefore, theoretical (≈10% Young's modulus) is not generally achievable for macroscopic objects. On contrary, nanotubes, which almost defect-free, should achieve that would be reflected in superior properties. In this study, both tensile tests buckling experiments individual WS 2 nanotubes were carried out a high-resolution scanning electron microscope. Tensile MoS simulated means...

Recently, a method to produce bulk quantities of pure multiwall WS2 nanotubes, which could reach several microns in length, has been developed. A detailed study the growth mechanism these nanotubes undertaken, is reported hereby. series experiments were conducted define key parameters, determine shape nanotubes. An alternative approach for synthesis starting from long WO3-x nanowhiskers, can be extended other described as well.

Abstract WS 2 nanoparticles with closed‐cage structure (fullerene‐like IF) are already being synthesized in macroscopic amounts from the respective oxide nanoparticles. They have been studied as superior solid lubricants under harsh conditions recent years. Under severe contact both fluids and greases squeezed out area consequently do not provide adequate lubrication conditions. Addition of even a small amount IF to oil was found reduce friction coefficient wear rate, increase load‐bearing...

It is shown that careful photoetching of n-WSe2 leads to a large improvement in its photoresponse. Conversion efficiencies excess 14% were obtained polyiodide solution under simulated solar light. A significant red shift the photocurrent spectrum observed after as well hexagonal etch pits which reduce reflectivity surface.

We report on the synthesis of inorganic fullerene-like molybdenum disulfide (MoS2) nanoparticles by pulsed laser ablation (PLA) in water. The final products were characterized scanning electron microscopy, X-ray diffraction, transmission and resonance Raman spectroscopy, etc. Cell viability studies show that as-prepared MoS2 have good solubility biocompatibility, which may a great potential various biomedical applications. It is shown technique PLA water also provides green convenient method...