Nucleation of WS₂Fullerenes at Room Temperature

Abstract

Abstract. 2014 Inorganic nested fullerene-like particles of layered compound WS2 were observed by high resolution transmission electron microscopy. It is shown, for the first time, that these structures can be nucleated inside the amorphous matrix at room temperature. At this condition the nucleation process may take 3-4 years.Microsc. Microanal. Microstruct. 7 (1996) after having been denied an exit visa for 8 years, during which he was fired from his job as an electron microscopist in the State Institute of Rare Metals in Moscow and forced to do various jobs to make his leaving. After a short adaptation period at the Weizmann Institute, he started to exhibit his skills as a meticulous and innovative electron microscopist. We, that have been exposed to rudimentary electron microscopy prior to his venue, found it a unique opportunity and a privilege to work with him, and enjoy his skills. With him we passed the happiest moments of discovering the power of transmission electron microscopy and unraveling new structures of matter. The legacy of Lev will be followed up by the many students which he had trained and by many of us for whom electron microscopy became almost a second habit. We all mou>tn the passing of a charming person, who combined the greatest skills with an excellent humor and lasting laughter, which we will always remember.

Production of WS2 Nanotubes by an Activation Method

“…For example, efficient photodiodes have been fabricated from mixtures of electron-and holeaccepting polymers. [4,5] These polymer composites, which are deposited by spin-coating from solution, contain a high surface area of dispersed interfaces at which photogeneration of charges is efficient. The morphology of the polymer mixture is crucial to the efficient operation of these devices.…”

“…The fullerene-like structures had nucleated at room temperature in the initially amorphous substrate. [5] The relative ease with which fullerenes are produced in WS 2 suggests that for this substance, nanotube production might be possible under less extreme conditions than those required for the production of carbon nanotubes. In this report we present the results of TEM and atomic force microscopy (AFM), which presents evidence showing that this is indeed the case.…”

“…[11] In contrast to the conditions required to produce carbon nanotubes, there is one example in the literature that describes the formation of WS 2 fullerenes under ambient conditions. [5] The sample was prepared as follows: Amorphous W was deposited on a quartz substrate, which was then oxidized and subjected to heat under an atmosphere of H 2 S/ N 2 H 2 . The sample was then examined with transmission electron microscopy (TEM) just after production, and it was found to be completely amorphous.…”

Structure and Stability of Molybdenum Sulfide Fullerenes

“…In early work, the formation of hollow MoS 2 clusters with octahedral or tetrahedral shapes was often observed. [2,9,10] Laser ablation was used to produce MoS 2 nano-octahedra with diameters of 3-5 nm. [11] These closed nanocages are the smallest IFs.…”

Struktur und Stabilität von Molybdänsulfid‐Fullerenen

“…In früheren Arbeiten wurde häufig die Bildung von hohlen MoS 2 -Clustern mit oktaedrischer oder tetraedrischer Struktur beobachtet. [2,9,10] Mithilfe von Laserablation wurden MoS 2 -Nanooktaeder mit 3-5 nm Durchmesser hergestellt. [11] Diese geschlossenen Nanokäfige sind die kleinsten anorganischen Fullerene.…”