Network data shows that tungsten trioxide with a particle size in the range of 100nm-1000nm is called submicron yellow tungsten oxide. According to the quantum size effect, although the specific surface area of submicron yellow tungsten oxide is smaller than that of nano tungsten oxide, it still has the advantages of excellent gas sensitivity and not easy to agglomerate.
Gas sensitivity can be simply understood as the appearance characteristics of chemical materials, such as color, which easily changes significantly with the change of a certain gas concentration. Submicron yellow tungsten oxide has a good gas-induced color effect, and is often used in gas sensors to detect low-concentration toxic gases, such as nitrogen oxides, ammonia, carbon monoxide, hydrogen sulfide, etc., which can effectively avoid related staff Inhaled poison gas and coma, even shock. Tungsten oxide thin film gas sensors and tungsten oxide nanoparticle sensors have been prepared.
It is reported that during the response process of the metal oxide semiconductor gas sensor, the interface of the sensitive material undergoes selective catalytic oxidation of gas molecules and changes in the electrical properties of the material (such as resistance), and this change indicates the physical and chemical properties of the gas molecules and Concentration and other characteristics. Therefore, the design of a crystalline semiconductor metal oxide material with a rich pore structure, a high specific surface area and a good carrier transport framework is helpful to improve the gas-sensing response performance.
Submicron yellow tungsten oxide has become the preferred gas-sensing material of many manufacturers nowadays due to its good semiconductor effect and large specific surface area.
In the era of rapid social and economic development, the development direction of gas sensors has begun to develop in the direction of miniaturization, integration, modularization, and intelligence. It is widely used in home appliances, automobiles, medical, environmental protection, industry, energy measurement and other fields at home and abroad.
