Preparation of Fullerene Structure Nano Tungsten Disulfide

Fullerene-structured nano tungsten disulfide is a research group led by R. Tenne, a scientist at the Weizmann Academy of Sciences in Israel. Using fluidized bed technology and corresponding nano-scale tungsten oxide as precursor, macro-synthesis of tungsten disulfide nano-materials is realized.

In the actual research process, Chinese scientists believe that foreign technology has the defects of complex, long reaction time and high preparation cost. They have innovated a more advanced technology of nano-tungsten disulfide with fullerene structure. The main steps are two steps, commonly known as "two-step method".

The specific preparation steps include:

A. Sodium tungstate was dissolved in deionized water at room temperature to obtain 5-40g/100ml sodium tungstate solution. The aqueous tungstate sol was obtained by cation exchange resin.

B.The tungstic acid colloid particles were stabilized and dispersed by adding 1-3% polyethylene glycol by weight of tungsten oxide, or 4-6% DMSO.

C. Dried tungstic acid sol was dried at 90 to 110 degrees Celsius to obtain tungstic acid xerogels.
D. The tungstic acid xerogel was reduced by hydrogen for 1 h at 575-600 C to obtain low-valent nano-WO3-x with purple-black appearance.

F.Nano-WO3-x and sulfur were mixed in a molar ratio of 1:2-20, and then placed in a stainless steel reactor. The tungsten disulfide powders with fullerene structure were prepared by self-pressurized reaction at 500-950 C for 1-2 hours and then cooled to room temperature.

In China's scheme, one-step gas-phase synthesis method was replaced by two-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step one-step method, namely, WO3-X was synthesized by using the advantages of easy control of the size of oxide nanoparticles synthesized by gas-phase method and fast reduction reaction. The scheme has the advantages of low raw nanometer tungsten disulfide can reduce the cost of preparation, which is of great significance for the industrial preparation and application of fullerene-structured tungsten disulfide.

• < Prev
• Next >