Mesoporous Structure WO3 Gas Sensor

Gas Sensor Picture

Mesoporous materials are a kind of nano-material, with nanoscale pore structure. Nano material is the solid material which scale is 1~100nm, because of its small size, the interface between the surface of the particle or particles is relatively large, and its surface atoms are active, while the size of nanoscale materials, electron wave function similar correlation length, nanomaterials often have special properties different from the classic material exhibits quantum effect, surface effect, small size effect, etc., which gives special properties of nanomaterials for sensing, catalysis, drug, medicine, ceramics, etc. and many other fields which have broad developing prospects.

Mesoporous tungsten oxide gas sensor is a kind of gas sensor based on tungsten oxide mesoporous material, high surface area mesoporous structure provides an enlarged contact interface and open-cell structure, to help achieve more desirable gas sensing performance. Currently mesoporous material as a gas sensor sensitive material such as ZnO, TiO2, SnO2, etc., has been carried out some research, mainly as a thin film or thick film form as a sensitive layer. For example, SnO2, by hydrothermal decomposition materials prepared porous structure as compared with the use of other materials to achieve a chemical method, the former has a better response to H2 and CO.

Besides that, there are more targeted experimental research, the Japanese scholar Takeo Hydod prepared SnO2 which has an ordered structure of the molecular sieve, the average pore structure is 4.4nm, the specific surface area reaches 374m2 / g, thanks to its huge surface area, gas sensing performance to NO2 has been greatly improved. The study of gas sensors for mesoporous tungsten oxide groups also started, LGTeoh used surfactant and other organic template, WCl6 tungsten oxide as precursor by sol-gel method, the gel coated prefabricated there filming an alumina base platinum electrode, and then remove the organic template with high temperature heat treatment, to obtain tungsten oxide film worm-like pore structure, and as a gas sensitive layer, a test for gas sensing performance elements in 35oC~100oC between 3ppm of NO2 to be tested to give excellent sensitivity, experimental results show that the structure of mesoporous tungsten oxide has a huge potential in gas sensing applications.