Preparation Method of Tungsten Trioxide Graphene Composite Material (Ⅱ)

In addition to in-situ synthesis technology, ex-situ synthesis technology is also a preparation method for tungsten trioxide/graphene composite materials. At present, there are many reports, which mainly include the two steps of pre-preparation of the dispersion of tungsten trioxide nanoparticles and the dispersion of graphene/graphene oxide and the mixing and reduction.

Gang Gu first used Na2WO4•2H2O and HBF4 as raw materials for hydrothermal treatment at 120°C for 10 hours, washed and dried to obtain tungsten trioxide nanosheets, then added the tungsten trioxide nanosheets to the graphene dispersion, stirred for several hours, and vacuumed filtration and treatment at 600°C under an argon atmosphere for 2 hours to obtain a tungsten trioxide/graphene composite.

II-Doo Kim et al. first obtained the tungsten precursor/PVP composite fiber by electrospinning, and then treated the tungsten trioxide nanowires at a high temperature of 500°C for 1 hour. They were ultrasonically dispersed in alcohol, and then the alcohol of tungsten trioxide was dispersed. The solution is mixed with the graphene acetone dispersion, filtered, washed and dried to obtain a tungsten trioxide/graphene composite.

Peng Cui et al. first prepared tungsten trioxide nanorods by hydrothermal method, dispersed them in deionized water, ultrasonically dispersed graphene in an alcohol solution, mixed the two dispersions, and irradiated them under a 150W xenon lamp for 4 hours, and centrifuged. After drying, a tungsten trioxide/graphene composite is obtained.

In summary, although great progress has been made in the synthesis of tungsten trioxide/graphene composite materials, whether it is in-situ synthesis technology or ex-situ synthesis technology, it involves washing, filtering and drying steps. There are many common exist problems include too many synthesize steps, long time, difficult solid-liquid separation, intermittent operation, low output and many other problems, which seriously hinder its commercial synthesis.

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