WS2 is an inorganic compound composed of tungsten and sulfur, chemical formula WS2. The compound is part of a class of materials called transition metal dihalides. It occurs naturally in the form of the rare mineral tungsten. This material is a component of some catalysts used for hydrodesulfurization and hydrodenitrification.
Is WS2 toxic?
WS2 does not pose a significant health hazard and exposure is mainly associated with dust from crushing and grinding operations. Long-term inhalation of dust can cause damage to a person's lungs.
Is WS2 magnetic?
WS2 (WS2) and molybdenum disulfide (MoS2) are two of the most popular industrial dry film lubricants. Both are similar in appearance, color, and high chemical durability. Both are dry lubricants, non-magnetic, and compatible with liquids such as paints, oils, fuels, and solvents
WS2 is used as a catalyst for hydrotreating crude oil together with other materials. In recent years, WS2 has also been used in saturable passive mode-locked fiber lasers to generate femtosecond pulses.
Flake WS2 is used as a dry lubricant for fasteners, bearings, and molds, and has important uses in aerospace and military industries.WS2 can be applied to metal surfaces without the need for adhesives or curing.
Large single crystal WS2 single layer
With the performance of silicon-based semiconductor technology approaching the limit, new materials that can technically replace or partially replace silicon are urgently required. More recently, the emergence of graphene and other two-dimensional (2D) materials provides a new platform for building next-generation semiconductor technologies. Among them, transition metal halogens (TMDs), such as MoS2, WS2, MoSe2, WSe2, are the most attractive two-dimensional semiconductors.
The premise for building super-scale high-performance semiconductor circuits is that the substrate must be a single wafer, like the silicon wafers used today. Despite considerable efforts to develop TMD wafer-level single crystals, success to date has been very limited.
Professor Ding Feng and his research team from the Multidimensional Carbon Materials Research Center (CMCM) at the Institute for Basic Science Research (IBS) of the United Nations University of Science and Technology, in collaboration with researchers from Peking University, Beijing Institute of Technology, and Fudan University, have recently reported a method for directly growing 2-inch single crystal WS2 monolayer films. In addition to WS2, the research team also demonstrated the growth of single-crystal MoS2, WSe2, and MoSe2 at the wafer scale.
The key technique for epitaxial growth of large single crystals is to ensure that all small crystals grown on the substrate are uniformly arranged. Since THE TMD has an acentric symmetry or the mirror image of the TMD has an opposite arrangement concerning its edge, we must break this symmetry by carefully designing the substrate. Based on the theoretical calculation, the author proposed a "double coupling guided epitaxial growth" experimental design mechanism. The ws2-sapphire plane interaction is the first driving force, resulting in two preferred antiparallel directions for WS2 island.WS2's coupling to the sapphire step edge is the second driving force that breaks the degeneracy of the two antiparallel directions. Then, all the TMD single crystals grown on the step edge substrate are unidirectional, and finally, these small single crystals merge to form the same size substrate large single crystals.
"This new double-coupled epitaxial growth mechanism is new for the growth of controlled materials. In principle, if we find the right substrate, we can grow all 2D materials into single crystals with large areas."Ting Cheng, one of the study's first authors."We have thought theoretically about how to choose the right substrate. First, the substrate should have less symmetry, and second, it is better to have more steps."
"This is an important step forward in the field of two-dimensional material devices. With the successful growth of wafer-level single-crystal 2D TMD on transition metal substrates other than graphene and hBN insulators, our research provides a necessary building block for the high-end applications of 2D semiconductors in electronics and optical devices, "explained Professor Ding Feng.
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