Molybdenum Sulfide Selenide (MoSSe) Powder
Molybdenum sulfide selenide (MoSSe) is a two-dimensional TMDC. It is often referred to as a "Janus" MXY transition metal dichalcogenide.
Janus MoSSe consists of three layers of atoms: Sulfur, molybdenum, and selenium from the top to the bottom in the sequence of S-Mo-Se. The geometry of monolayer Janus MoSSe is different from MoS2 and MoSe2 - with one side of the Janus MoSSe structure being S atoms, and the other side being Se atoms. The Mo atom layer is sandwiched between S and Se layers, and multilayers of MoSSe are stacked by the vdW interactions. Due to the the structural asymmetry and a large out-of-plane piezoelectric polarisation of Janus MoSSe, it is possible to stack the dipoles of the individual layers and obtain an atomically-thin pn-junction across the multilayer system by stacking multiple Janus MoSSe layers on top of each other.
Similar to MoS2, the MoSSe monolayer also exhibits a honeycomb pattern from the top view of the lattice. However, the mirror symmetry is broken due to the different electronic properties of sulfur and selenium, which leads to the polar properties of MoSSe.
Bilayer MoSSe shows a preferred pattern with AC-stacking, where the S atom in the bottom layer is pointing to the Mo atom in the top layer. The dipole properties, and carrier mobility of the electron and hole are greatly affected by changing the thickness of multilayer MoSSe films.
|Molecular weight||206.96 g/mol|
|Bandgap||2.14 eV (direct) |
|Classification / Family||Janus transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Materials science|
|Preparation||Synthetic - Chemical Vapour Transport (CVT)|
|Electronic properties||2D Semiconductor|
Janus MoSSe monolayers possess the highly-desired vertical piezoelectric effect, which leads to enhance the flexibility and compatibility in piezoelectric device operations. The out-of-plane piezoelectricity also provides a platform to design nanoelectromechanical devices and future spintronics. Mono- and multi-layer Janus MoSSe have also been used as photocatalysts for solar water splitting and lithium-Ion batteries.
Molybdenum sulfide selenide powder is obtained via the CVT method, with purity typically in excess of 99.995%.
High-purity molybdenum sulfide selenide powder is generally used to prepare MoSSe nanosheets and nanoparticles by liquid exfoliation. High-purity MoWSe2 powder can also be used in CV deposition to prepare high-quality mono- and bi-layer films.
Literature and Reviews
- Tunable Electronic and Optical Properties of Monolayer and Multilayer Janus MoSSe as a Photocatalyst for Solar Water Splitting: A First-Principles Study, Z. Guan et al., J. Phys. Chem. C, 122, 6209−6216 (2018); DOI: 10.1021/acs.jpcc.8b00257.
- Distorted Janus Transition Metal Dichalcogenides: Stable Two-Dimensional Materials with Sizable Band Gap and Ultrahigh Carrier Mobility, X. Tang et al., J. Phys. Chem. C, 122, 19153−19160 (2018); DOI: 10.1021/acs.jpcc.8b04161.
- Efficient Charge Separation in 2D Janus van der Waals Structures with Built-in Electric Fields and Intrinsic p−n Doping, A. C. Riis-Jensen et al., J. Phys. Chem. C, 122, 24520−24526 (2018); DOI: 10.1021/acs.jpcc.8b05792.
- Theoretical Prediction of Janus MoSSe as a Potential Anode Material for Lithium-Ion Batteries, C. Shang et al., J. Phys. Chem. C, 122, 23899−23909 (2018); DOI: 10.1021/acs.jpcc.8b07478.
- Electronic and Optical Properties of Pristine and Vertical and Lateral Heterostructures of Janus MoSSe and WSSe, F. Li et al., J. Phys. Chem. Lett., 8, 5959−5965 (2017); DOI: 10.1021/acs.jpclett.7b02841.
- Stacked Janus Device Concepts: Abrupt pn-Junctions and Cross-Plane Channels, M. Palsgaard et al., Nano Lett. 2018, 18, 7275−7281 (2018); DOI: 10.1021/acs.nanolett.8b03474.
- Janus Monolayer Transition-Metal Dichalcogenides, J. Zhang et al., ACS Nano, 11, 8192−8198 (2017); DOI: 10.1021/acsnano.7b03186.
- A Janus MoSSe monolayer: a potential wide solarspectrum water-splitting photocatalyst with a low carrier recombination rate, Mater. Chem. A, 6, 2295 (2018); DOI: 10.1039/c7ta10015a.
- Tunable dipole and carrier mobility for a few layer Janus MoSSe structure, W. Yin et al., J. Mater. Chem. C, 6, 1693 (2018); DOI: 10.1039/c7tc05225a.
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