There are many types of near infrared shielding material, among which nano tungsten trioxide is unique. Tungsten trioxide is a kind of metal oxide. And as a heat-insulating material, WO3 has become one of the research hotspots in the field of science. It is attributed to the advantages that metal oxides (including WO3) have, such as, easy availability of raw materials, various preparation methods, and simple processes, etc.
In 1978, Professor H.G. Heller, a well-known British chemist and pioneer of photochromism, pointed out that photochromic reactions can be used for optical information storage and optical recording. Therefore, the research on photochromic materials entered a new stage. After that, many new types of photochromic materials have been discovered one after another, such as organic compounds including spiropyrane, heteropoly compound including phosphotungstic acid, and organic-inorganic compound, metal halide including Ag-Cu, and metal oxide. Among them, metal oxide becomes research hotspots in the field of materials science as it is widely used in information storage, display and sensitive devices.
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