Continuous Preparation of Tungsten Trioxide Nanoparticles by Gas Phase Method

Tungsten trioxide (WO₃) is an important n-type semiconductor oxide, which has a variety of crystal structures. Due to its unique physical and chemical properties, it has been widely studied, and has been applied in electrochromic, photochromic, sensing and catalytic fields. In order to further utilize the excellent properties of WO₃ and broaden its application field, the best technical way is to reduce its grain size, that is, nano tungsten oxide.

Gas phase method is one of the most effective methods to prepare nanostructures. With APT·xH₂O as raw material, high temperature sintering and gas deposition technology, argon as carrier gas, and powder collection in low temperature area, the continuous preparation of tungsten trioxide nanoparticles with various morphology can be successfully prepared. The method includes the following steps:

Step 1, take the quartz glass tube including the air inlet and the air outlet, place the carbon cloth around the inner wall of the quartz glass tube near the air outlet end, and place the quartz glass tube with the carbon cloth horizontally in the tubular furnace.

Step 2, heat the quartz glass tube in the tubular furnace to the specified temperature.

Step 3, push the ceramic crucible containing ammonium paratungstate into the glass tube, and blow argon into the constant temperature zone heated to the specified temperature.

Step 4, close the tubular furnace and stop blowing argon after holding for 40min-60min.

Step 5, take out the carbon cloth, collect the reaction products deposited on it, get the multi morphology nano tungsten trioxide particles, and take out the ceramic crucible.

Step 6, repeat steps 1-5 for several times: put carbon cloth around the inner wall of glass tube again, move the crucible containing ammonium paratungstate to constant temperature area, turn on argon again, start the next round of reaction, and realize continuous production.

By combining high temperature sintering technology and gas deposition technology, using argon as carrier gas and using carbon cloth to collect powder in low temperature area, we can continuously produce various forms of nano-sized tungsten trioxide particles, which solves the problem of low output of traditional methods. The process is easy to operate, low cost and has great application prospect.

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