Micro fine yellow tungsten oxide’s producing method may be classified into three types including physical method, chemical method (liquid phase method) and comprehensive method in accordance with the reaction characteristics described in the theory of crystal nucleation. And the liquid phase method can be divided into precipitation method, hydrothermal method, a microemulsion method, and sol-gel method according to different producing processes.
The yellow tungsten oxide is primarily prepared by controlling the crystallization process, and it mainly goes through two steps:
1. To generate grains with microstructure as the core of crystals.
2. Crystal nucleus to grow to become macroscopic crystals.
At present, micro fine yellow tungsten oxide is widely used in solar energy absorption, photocatalysis, photoluminescence, sensor, and fuel cell due to its unique physical and chemical properties such as photochromism, electrochromism, gas sensoring, catalysis, and pressure sensoring, etc. Therefore, it has become a hot topic to adopt more environmentally friendly and more efficient technology to prepare micro-fine yellow tungsten oxide powder.
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