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Using Gas Phase Method and Solid Phase Method to Produce Nano Molybdenum Disulfide

Using gas phase method to produce nano molybdenum disulfide

Gas phase method is directly using gas or through using a various of means to change the materials into the gas, so that the materials will occurs chemical changes or physical changes, and finally condensed and growth in the cooling process forming nanoparticles. Gas phase method has simple process, quick response and other advantages, but it has higher reaction equipment requirements and the products purity is not high which produce by gas phase method. In the gas phase methods the chemical vapor deposition (CVD) process is the most simple. The reaction process of CVD without filtration, drying and other processes, and no waste water discharge, waste gas easily recovered and other advantages, so it is widely used in industrial fields.

There will introduce two simple methods of gas phase method for nano molybdenum disulfide production:
1.Using molybdenum trioxide (MoO₃) and sulfur as raw material, after mixing, at high temperature put the mixed powder into tube furnace then it will occurs gas phase reaction and to produce molybdenum disulfide (MoS₂) nanotubes. The experiment found that the reaction temperature, air flow rate has some impact on the products. When the reaction temperature is 810 ~ 905 ℃ can to generate MoS₃ nanotubes, and when the air flow rate at unsuitable conditions, it is possible to generate MoS₂ or MoO₂-xSx.
2.Putting the MoO₃ into tube furnace heat to 850 ℃, then pass into H₂S + (H₂ + N₂) [φ (H₂) = 5%, φ (N₂) = 95%] reducing gas, and finally in a reducing atmosphere MoO₃ and H₂S react to produce fullerene nanoparticles and nanotubes.

Using solid phase method to produce nano molybdenum disulfide

Solid phase method is a raw material by physical or chemical processes for preparing nanometer molybdenum disulfide in the solid state. Solid phase method generally does not destroy the crystal structure of molybdenum disulfide, and simple operation, high conversion rate, low pollution and it can avoid the agglomeration phenomenon which appears in liquid phase method. However, the solid phase method has high equipment requires and high energy consumption, while products are difficult to control particle size and shape and other shortcomings. So it is difficult to be widely used in industry.

There will introduce two simple methods of gas phase method for nano molybdenum disulfide:
1.The MoS₂ and I₂ powder was placed in a quartz tube heating at the high-end, maintaining a certain temperature gradient, the quartz tube to maintain a certain degree of vacuum, after dozens of days, resulting in the low-end of the quartz tube to produce MoS₂ nano and microtubes.
2. Using supersonic jet mill machine to pulverize MoS2 powder obtain nanometer molybdenum disulfide.

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