Nano grain size violet tungsten oxide, or WO2.7, can be applied for the preparation of near-infrared shielding material. The non-stoichiometric properties of WO2.72 have been an interesting topic over the past decades. As the near-infrared absorbing properties of violet tungsten oxide have received greater attention recently, the photothermal performance of tungsten trioxide (WO3) in other optical regions has also been investigated.
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In addition, many other forms of WO3?x such as WO2.9 and WO2.83, which generally are blue in color, have also been considered because of their unusual defects. These defects improve the electrical conductivity by a large degree. However, these materials are not soluble in any solvent. With a prolonged time, they can be oxidized to WO3. Moreover, the low crystallinity of WO2.72 may be a concern. Thus far, the photothermal capabilities of other forms of WO3?x are still unknown. Well, what we have known is that nano grain size violet tungsten oxide is a good dingal material for producing near-infrared shielding material, thereby applying in building glasses to reduce energy consumption.
