Nano particle size tungsten trioxide may be applied for producing near-infrared shielding material. And the shielding material is widely used in heat insulation fields such as sun room, glass curtain wall and car film. Therefore, it is necessary to conduct in-depth research on nano grain size tungsten trioxide, for example, to study the effect of urea on hexagonal phase tungsten trioxide.
Studies have shown that monovalent cations located in the hexagonal phase tungsten trioxide pores enable the metastable hexagonal phase tungsten trioxide to be stably present. For example, NH4+ is capable of stabilizing the hexagonal phase tungsten trioxide skeleton. If the NH4+ in the skeleton is removed, the hexagonal skeleton structure will collapse. This indicates that monovalent cations play an important role in stabilizing the structure of the hexagonal phase tungsten trioxide. The urea can hydrolyze under hydrothermal conditions, releasing NH4+ and HCO3- and slowly adjusting the pH of the reaction system. Therefore, it is necessary to study the role of urea in the reaction process.
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