How to Prepare Tungsten Disulfide with Fullerene Structure

In order to overcome the shortcomings of the existing technology, chemical researchers designed a method for preparing nano-tungsten disulfide with a fullerene structure. 

The preparation process mainly adopts a two-step method: In the first step, tungstic acid sol is obtained by acidifying sodium tungstate or cation exchange with sodium tungstate, adding an organic dispersant to the tungstic acid sol, and reducing it with hydrogen in a reduction furnace to obtain nano WO3-x. In the second step, the nano-WO3-x and the elemental sulfur are mixed and subjected to a self-pressurization reaction in a closed metal container to obtain a nano-tungsten disulfide powder material with a fullerene structure.

The specific preparation steps include:

(1) Dissolve sodium tungstate in deionized water at room temperature to obtain a sodium tungstate solution with a concentration of 5-40g/100ml, and pass the sodium tungstate solution through a cation exchange resin to obtain a tungstic acid hydrosol.

(2) Add 1-3% polyethylene glycol by weight of tungsten oxide or 5% dimethyl sulfoxide to the above-mentioned tungstic acid hydrosol to realize the stability and dispersion protection of tungstic acid colloidal particles.

(3) Dry the dispersed and stable tungstic acid hydrosol at 110°C to obtain a tungstic acid xerogel.

(4) Put the tungstic acid dry gel at 575-600°C and reduce it with hydrogen for 1 hour to obtain low-valent nano-tungsten oxide WO3-x with a purple-black appearance.

(5) Mix nano-WO3-x and elemental sulfur according to a molar ratio of 1:2-20, and then place them in a stainless steel reactor, and heat the reactor to 500-950T to react under pressure for 1-2 hours and then cool to room temperature. Then, the nano-tungsten disulfide powder material with fullerene structure can be obtained.

Compared with traditional production technology, the method for producing tungsten disulfide with a fullerene structure has simpler operation, lower production cost, shorter reaction time, and is suitable for large-scale production.

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