SKU: 80150399221

Thin Layer WS2 Nano Powder

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Description

Thin Layer WS2 Nano PowderProduct Name Name: thin Layer WS2 Nano Powder Product Overview Tungsten disulfide (WS2) is a type of transition metal sulfide (TMDC) with a graphene like layered structure, where the layers are stacked together by weak van der Waals forces. Single layer WS2 is composed of three layers of atoms, with the atomic planes of W and S arranged in a hexagonal array. The W atoms are sandwiched between the two layers of S atoms, forming an S W S atomic layer

Product Name

Name: thin Layer WS2 Nano Powder


Product Overview

 

Tungsten disulfide (WS2) is a type of transition metal sulfide (TMDC) with a graphene like layered structure, where the layers are stacked together by weak van der Waals forces. Single layer WS2 is composed of three layers of atoms, with the atomic planes of W and S arranged in a hexagonal array. The W atoms are sandwiched between the two layers of S atoms, forming an S-W-S atomic layer structure with a "sandwich" structure. Multi layer or block WS2 is composed of single layers stacked together. Depending on the stacking method of the single layers, WS2 has three crystal structures: 1T, 2H, and 3R.

The synthesis methods of WS2 are mainly divided into two categories: "top-down" stripping method and "bottom-up" method. The "top-down" exfoliation method includes micro mechanical exfoliation, liquid-phase exfoliation, and lithium-ion intercalation, mainly using physical means to exfoliate the bulk WS2 into a single-layer or few layer layered structure. The "bottom-up" method includes chemical vapor deposition, hydrothermal method, and high-temperature thermal decomposition method, mainly using chemical means to grow atoms and molecules into nanoscale thin films and granular WS2 under certain environmental conditions.

The WS2 provided by Xianfeng is prepared by lithium intercalation method, using n-butyl lithium as intercalation agent to insert lithium ions into the interlayer of WS2, forming LixWS2 intercalation compound. The intercalation compound reacts violently with solvent water to generate a large amount of H2, thereby increasing the interlayer spacing of WS2 and weakening the van der Waals forces between layers. After ultrasonic treatment, thin and few layer WS2 dispersions are obtained. The WS2 nanosheets obtained by lithium intercalation method have a 1T-2H phase hybrid structure. According to XPS calculation, the fitting ratio of 1T phase is about 60% (the values may vary between different batches).


Technical Parameter

 

Flake Size: 20-500 nm

Thickness: 1-5 nm

 

Product Features

 

1. Good dispersibility: Dispersions of different types of solvents are available (water, ethanol, isopropanol), as well as WS2 powder obtained by freeze-drying the dispersion.

2. Multiple active sites: It has good catalytic performance and a large specific surface area that can be used to load other catalysts to improve catalytic efficiency.

3. Excellent light absorption ability: It has strong absorption ability for near-infrared light and can be used for photocatalytic water splitting to produce hydrogen, organic pollutant degradation, etc.

4. Adjustable size and thickness: Different diameters and thicknesses of nanosheets can be customized to meet the experimental needs of different researchers.


Application Fields

 

1. Electronic and optoelectronic devices: The band structure is closely related to the thickness of the material layers, and the adjustability of WS2 thickness can give it different optoelectronic properties. Single layer WS2 has the advantages of high electron mobility, large on/off current ratio, and current carrying capacity, and can be used in the manufacturing of electronic devices such as transistors.

2. Electrochemical biosensors: WS2 exhibits excellent electrochemical sensing performance due to its large specific surface area, good electron mobility, and high electron density of states,

It can be used to detect biomolecules such as DNA and glucose, and has excellent selectivity for some organic molecules such as formaldehyde, ethanol, and benzene.

3. Biomedical: WS2 has good light absorption ability in the near-infrared region, which can convert light energy into heat energy. The high temperature generated can cause tumor cell apoptosis, and it also has good biocompatibility, making it an excellent photothermal conversion material.

4. Energy storage: WS2, due to its unique layered structure, can provide certain adsorption sites for energy storage; Meanwhile, WS2 has good stability and can be reused for cyclic charging and discharging, and is widely used in fields such as fuel cells, supercapacitors, and lithium batteries.

5. Catalyst: WS2, due to its light weight and large specific surface area, can be used as a photocatalyst. After visible light irradiation, WS2 can absorb photons, undergo electron transitions to form electron hole pairs, and react with water to generate hydroxyl radicals with high reactivity and strong oxidizing properties, which degrade organic matter into small molecules and inorganic ions.


INSTRUCTION FOR USE

Attention: When taking TEM images, it is necessary to use micro grids (with the thinnest possible thickness) to prepare samples, which makes it easy to observe their layered structure; Dispersed liquid is prone to oxidation when exposed to air, and its color will fade over time. When storing, inert gas can be introduced to remove oxygen and extend the use time; The dispersion liquid will contain lithium hydroxide, which acts as a stabilizer to aid dispersion and can be removed by centrifugal washing; The powder is obtained by freeze-drying the dispersion, and its dispersibility is slightly worse than that of the original solution.


Related Information

Please e-mail for the detailed characterization data.

E-mail:[email protected]

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