With the development of economy and society, the increasingly serious problem of environmental pollution, especially water pollution it has become a major challenge for humanity. There is a large proportion of antibiotic wastewater in the current water pollution, and its hard to degrade in the environment and continuing to accumulate which are serious threats to the ecological environment and human health. Nano-materials technology for solving problems related to energy and environmental issues gets more and more attention. Because nano-semiconductor materials have better photocatalytic activity is widely used in catalytic degradation of pollutants in water. Nano tungsten trioxide is one important class of semiconducting material, it has good photocatalytic properties.  

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At present, the detection of gases mainly oriented for hydrogen, hydrogen sulfide, hydrocarbons, nitrogen oxides, ammonia, ethanol, liquefied petroleum gas (LPG), gas pipelines and other reducing gas, flammable gas and toxic gas. Sensitive material is widely used mainly SnO2, ZnO, SiO2, TiO2, Fe2O3, WO3 and other metal oxide materials. Tungsten trioxide developed in recent years is kind of a semiconductor material having excellent gas sensing properties. It is reported that the polycrystalline semiconductor powder particle size and surface area have an impact on its gas sensing properties. Nano WO3 particles have excellent gas sensing characteristics which is benefited from his small, large surface area, significant surface effect and quantum effects exhibits. Using thermal decomposition method to get WO3 material and the size of it is less than 100nm. Then add SiO2 into it, so that the original nano materials will have good sensitivity, selectivity, and short response time for NH3. WO3 can react with hydrogen and alkali metal and causing ionic reaction. Pt doping of WO3 gas sensing as insulation in the air it is suitable for monitoring hydrogen leak.

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Nano tungsten trioxide has a larger surface effect, is an important catalytically active material. It has good catalytic performance, but also for both primary catalyst co-catalysts. And it has the high selectivity with other corresponding reaction. After some related studies, it was found that the reduction or doped of WO3 join the active ingredient or modified will enhance its catalytic properties. Because the catalytic properties and physicochemical properties of WO3 was influent by incineration temperature, the preparation method so it can be used for hydrodesulfurization process, selective catalytic reduction of NOx, ectopic of olefins and other reactions. Acidic tungsten-based catalysts can be applied paraffins isomerization. Photocatalytic tungsten trioxide is a new field of catalysis. Many different semiconductor material is used as a photocatalyst for the decomposition of water into hydrogen and oxygen, light energy conversion rate of tungsten trioxide is not high, but because of simple preparation process of high purity WO3, near UV and light-emitting area has a strong the absorbent, the electrolyte can be maintained in a variety of long-term stability, which are made as a photocatalyst WO3 can exhibit better performance.

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WO₃ film is a new type of functional material, which has a wide range of applications in smart windows, a large area flat-panel displays, gas sensor, and so on the field. But because WO₃ Films has some shortcomings, such as discoloration and sensitivity is not high, it was a lot of restrictions in the application. In order to improve its performance so that it can be widely used and there has three way to optimize: one is preparing a novel surface topography WO₃ film, the second is the preparation of nanometer WO₃ composite film, third film doped WO₃ modified. With further research to expand, the need to find new chemicals, new fetters, explore preparation and preparation parameters appropriate to improve the surface appearance of the film become a hot topic.

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