Molybdenum Disulfide Powder
|Molecular weight||160.07 g/mol|
|Bandgap||1.23 eV ~ 1.9 eV |
|Classification / Family||Transition metal dichalcogenides (TMDCs), 2D semiconductor Materials, Nano-electronics, Nano-photonics, Materials science|
|Preparation||Synthetic - Chemical Vapour Transport (CVT)|
|Electronic properties||2D Semiconductor|
|Melting point||2375 °C (lit.)|
Molybdenum disulfide (MoS2) possesses a sizeable intrinsic band-gap. It takes the form of a layered structure, in which crystalline planes are bound together by relatively weak Van der Waals forces. Its unique chemical, mechanical, and electronic properties make it widely used as a lubricant and a photocatalytic material.
As a 2D semiconducting material, MoS2 undergoes transformation from an indirect semiconductor in its bulk form (band-gap 1.2 eV) to a direct band-gap semiconductor (band-gap 1.9 eV) in its monolayer form. This makes MoS2 an ideal candidate in the fields of physics, chemistry, biochemistry, and electronic engineering. Advanced applications are also emerging in FETs, energy storage, gas sensors, and many other electronic and photo-electronic devices.
MoS2 quantum dots have strong quantum confinement and edge effects. Thus, their direct-bandgap properties find applications in hydrogen evolution reactions (HER), photocatalytic hydrogen evolution, bioimaging and electrochemical lithium storage.
MoS2 powder is used for applications in thermoelectric-devices, sensors, LEDs, OPVs, and energy storage devices.
MoS2 powder is obtained via the CVT method, with purity typically in excess of 99.995%.
Molybdenum disulfide MoS2 powder is generally used to prepare MoS2 quantum dots solutions and nano-platelettes by liquid exfoliation assisted by sonication. High-purity MoS2 powder can also be used in CV deposition to prepare high quality mono-layer films.
Literature and Reviews
- Few-Layer MoS2: A Promising Layered Semiconductor, R. Ganatra et al., ACS Nano, 8 (5), 4074–4099 (2014); DOI: 10.1021/nn405938z.
- Molybdenum disulfide quantum dots: synthesis and applications, N. Arul et al., RSC Adv., 6, 65670 (2016); DOI: 10.1039/c6ra09060e.
- Preparation of Monolayer MoS2 Quantum Dots using Temporally Shaped Femtosecond Laser Ablation of Bulk MoS2 Targets in Water, B. Li et al., Sci. Rep., 7: 11182 (2017); DOI:10.1038/s41598-017-10632-3.
- One-Step Synthesis of Water-Soluble MoS2 Quantum Dots via a Hydrothermal Method as a Fluorescent Probe for Hyaluronidase Detection, W. Gu et al., ACS Appl. Mater. Interfaces 8, 11272−11279 (2016); DOI: 10.1021/acsami.6b01166.
- MoS2 Quantum Dot-Interspersed Exfoliated MoS2 Nanosheets, D. Gopalakrishnan et al., ACS Nano, 8 (5), 5297–5303 (2014); DOI: 10.1021/nn501479e.
- Quantum confinement effects across two-dimensional planes in MoS2 quantum dots, Z. Gan et al., Appl. Phys. Lett. 106, 233113 (2015); doi: 10.1063/1.4922551