Molybdenum is a Block D, Period 5 element, and sulfur is a Block P, Period 3 element. This article discusses the properties and applications of molybdenum disulfide nanoparticles. Molybdenum does not occur naturally as a free metal on Earth.
Generally, molybdenum disulfide has very good chemical stability and thermal stability. They can form a highly efficient dry lubricating film. Molybdenum disulfide nanoparticles possess a low friction coefficient, good catalytic activity, and excellent physical properties. They also have a large active surface area, high reactivity, and increased adsorption capacity compared to the bulk material.
Molybdenum disulfide nanoparticles appear in a black solid form.
The chemical properties of molybdenum disulfide nanoparticles are outlined in the following table.
||Molybdenum [Kr] 4d5 5s1
Sulfur [Ne] 3s2 3p4
The physical properties of molybdenum disulfide nanoparticles are given in the following table.
The thermal properties of molybdenum disulfide nanoparticles are provided in the table below.
Molybdenum disulfide nanoparticles can be synthesized at high temperature as mono- and polycrystalline materials or at low temperature using various electro-chemical routes. In the low temperature method, a chemical solution reaction route can be used between the organometallic precursor Mo(CO) 6 and sulfur in p-xylene at 140°C. The MoS2 nanoparticles obtained is of 10–30 nm diameter, and mostly amorphous with a rounded shape.
The key applications of molybdenum disulfide nanoparticles are as follows:
- In lubricant applications
- In difficult to maintain equipment, such as space vehicles, satellites and military fields
- In composite applications
- As a conductive filler
- As a catalyst for coal liquefaction
- Can be used to prepare special materials, catalytic materials and gas storage.