Product Name
Name: Single Layer WS2 quantum dots 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 quantum dots provided by Xianfeng are prepared by lithium intercalation method, and large areas of molybdenum disulfide are removed by centrifugation in the later stage of preparation. Quantum dots are the main component, and some nanosheets may remain. Quantum dots prepared by intercalation method do not emit light, but due to their numerous defects and specific surface area, they are ideal materials for electrochemical applications.
Technical Parameter
Preparationââ‚?/span>method: Lithium-ion intercalation
Particle:< 10nm
Product Features
Two dimensional nanostructure: Single layer tungsten disulfide quantum dots are composed of a single layer of tungsten disulfide, with nanoscale dimensions in two dimensions and only a single atomic layer in the third dimension (thickness). This two-dimensional nanostructure endows it with unique physical and chemical properties.
Quantum confinement effect: Due to its nanoscale size, single-layer tungsten disulfide quantum dots exhibit significant quantum confinement effects, meaning their electrical and optical properties are significantly different from bulk materials.
High specific surface area: The single-layer structure enables quantum dots to have a very high specific surface area, which is beneficial for increasing the number of surface active sites, thereby improving their catalytic, sensing, and other properties.
Excellent optoelectronic performance: Single layer tungsten disulfide quantum dots have excellent optoelectronic properties, such as high electron mobility and fast carrier transport speed.
Good chemical stability: Single layer tungsten disulfide quantum dots have high chemical and thermal stability, and are not easily degraded in air and water.
Application Fields
Electrocatalysis: WS2 monolayer quantum dots exhibit excellent activity in electrocatalytic reactions and can be used in reactions such as water splitting and hydrogen production. Their high specific surface area and abundant active sites make catalytic reactions more efficient.
Photocatalysis: Under illumination conditions, WS2 monolayer quantum dots can absorb light energy and generate photo generated electrons and holes, thereby triggering photocatalytic reactions.
Chemical sensor: By surface modification or doping, the chemical properties of WS2 monolayer quantum dots can be regulated, which can be used to detect harmful substances and biomarkers in the environment.
Drug delivery: Through surface modification or encapsulation methods, drug molecules can be combined with WS2 monolayer quantum dots to form drug delivery systems that can selectively deliver drugs to the lesion site, improve treatment efficacy, and reduce side effects.
In the field of energy, the high conductivity and excellent catalytic performance of WS2 monolayer quantum dots make them have potential applications in the field of batteries. For example, they can be used as negative electrode materials for lithium-ion batteries, improving the battery's storage capacity and cycling stability.
Related Information
WS2 QDs solution is kept in cold storage at 4 C, requiring inert gas protection and used in a week. The longest time is 1 months.
WS2 QDs powder is kept in the normal temperature drying and avoiding light seal. The longest time is 3 months.
Please e-mail for the detailed characterization data.
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