Tungsten Disulfide (WS2)
Tungsten disulfide (WS2) powder has been used for many years as a dry lubricant due to how it exhibits similar properties to molybdenum disulfide (MoS2), such as a low coefficient of friction, high chemical stability, and thermal stability. In 1992, it was discovered that the structure of WS2 made it capable of forming nanotube structures. These nanotubes were the first examples of WS2 being used as a low-dimensional material.
After the discovery of simple mechanical exfoliation techniques to isolate single layers of 2D materials, it was possible to study the properties of WS2 flakes. It was shown that, just like MoS2, the band-gap of WS2 change from an indirect bandgap of 1.4eV to a direct bandgap of 2eV when changing from a bulk material to a 2D material. Due to its bandgap, WS2 is seen as a significantly interesting material for many areas of application.
Just like MoS2, WS2 possesses a high on/off ratio in field-effect transistors, controllable spin and valley polarisation, strong geometrical confinement of excitons, and tunable photoluminescence. Additionally, WS2 could lead to increased interest in areas such as photodetectors and multi-junction photovoltaics.
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Tungsten Disulfide Properties
Tungsten disulfide (WS2) exits in different forms, each with their own beneficial properties. Bulk WS2 offers advantages such as exceptional lubricity and high thermal stability.
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Introduction to 2D Materials
The foundation of technology is the understanding of material systems. Specific material properties are required depending on the application.
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