Alfa Chemistry focuses on two-dimensional (2D) nanomaterials technology businesses, mostly dealing with MXenes and MAX phase materials, black phosphorus, and other 2D nanomaterials technologies. Our research and development team is led by a group of PhDs that have completed international studies and have years of research experience. To fit your needs, we may "personalize" your molybdenum diselenide solutions. Please contact us right away so that we can assist you in rapidly resolving your issue.
Molybdenum Diselenide (MoSe2)
MoSe2 is a member of the TMDC family of transition metal disulfides. MoSe2, like graphite, has a two-dimensional lattice structure with layers packed together by van der MoSe2 can have a different phase structure than other TMDCs, such as MoSe2, with 2H triangular prismatic D3h or 1T octahedral Oh symmetry. The former is semiconducting, whereas the latter is metallic.
Fig 1. Crystal structures of MoSe2. (Eftekhari A, et al. 2017)
- The layered structure, combined with the size and conductivity of Se, makes it an excellent host for counter ions in electrochemical energy storage systems like lithium-ion and sodium-ion batteries.
- For hydrogen precipitation reactions and other electrocatalytic reactions, the unsaturated selenium atoms at the edges, defect sites, or changed basal planes show exceptional electrocatalytic activity.
- It is a good option for photocatalytic and photoelectrochemical solar cells due to its tunable band gap.
MoSe2 Solution Synthesis and Characterization
Alfa Chemistry provides unique solutions with MoSe2 flakes, which are widely utilized in the catalytic community. Our common method is liquid phase exfoliation which has been successfully used for the synthesis of various TMDC solutions. Lithium embedding is the best method for exfoliating MoSe2.
We synthesize MoSe2 solutions using ultrasonication of bulk MoSe2 high quality crystals synthesized by the vapor phase transport (CVT) technique. Because the CVT-grown MoSe2 crystalline material is extremely crystalline, sonication can stratify the crystals to form highly crystalline MoSe2 monolayers, a few layers, and some thick layers suspended in a solution. This will be determined by your needs. We can create single-layer, multi-layer, and even bulk-layered solutions.
Fig 2. Scheme of the liquid phase exfoliation process including immersion, insertion, exfoliation, and stabilization. (Eftekhari A, et al. 2017)
We have characterized MoSe2 nanomaterials by scanning electron microscopy MoSe2 measurements, transmission electron microscopy (TEM) measurements, electron energy dispersive spectroscopy (EDAX), Raman spectroscopy, etc. The flakes placed on various substrates create photoemission depending on the thickness of the layer (photoluminescence).
It is expected that the MoSe2 solution arriving to the customer may show phase separation, which is normal. To redisperse the solution, customers should shake it briefly or apply sonication.
| Specifications |
|
|---|---|
| Identification | MoSe2 solution resulting from layering of MoSe2 crystals grown by CVT method by ultrasonic technique |
| Physical Sizes | 1 to 10 layers thick (thicker fragments may be observed depending on usage), 10 nm to 10 microns lateral dimension. |
| Purity | 99.999% |
| Smoothness | Atomically smooth surface with roughness < 0.35 nm. |
| Crystallinity | Highly crystalline nanomaterials. No amorphous flakes, contaminants or hidden second phases. |
| Dispersant solution | Ethanol, isopropanol, deionized water, NMP, DMF, other solvents can be prepared as needed. |
| Stability | High environmental and dispersant stability. |
| Support | We provide full technical support and guarantee your satisfaction with our renowned customers. |
| Characterization Methods | Raman, EDS, AFM, SEM, TEM; Contact us for more information |
Note
Because international shipments typically only allow for modest volumes, we propose utilizing 2 mL of a supersaturated monolayer solution with a concentration of 80-120 mg/L (depending on the type of 2D layer) to save money and time on shipping. These supersaturated solutions are uniquely designed to be diluted into a large number of solutions.
Because of its environmental stability, thermal stability, dispersing characteristics, and non-polluting nature, ethanol is recommended as a dispersant solvent. However, if your research necessitates the use of additional solvents, please let us know what kind of solution you require.
Reference
- Eftekhari A, et al. (2017). "Molybdenum Diselenide (MoSe2) for Energy Storage, Catalysis, and Optoelectronics." Applied Materialstoday. 8: 1-17.
Please kindly note that our products are for research use only.
