Molybdenum Trioxide Applications
Molybdenum trioxide applications are widely used which mainly due to its special crystal structure and excellent features.
Electrochromic Application Electrochromic refers to material intervened by voltage, due to the electric field, to occur oxidation-reduction reaction, resulting in light absorption or light scattering properties of the material to change, which in turn causes a change in its color. This color change can reversibly change in response to an electric field. Molybdenum trioxide (MoO3) color change principle is as follows: Mo valence alternation caused light absorption and the electrons and ions simultaneously inject into the interstitial void to cause coloring. Equation is expressed as: MoO3 + xA ++ xe- → AxMoO3.
Smoke Suppression - Flame Retardant Application Polyvinyl chloride (PVC) is a widely used general-purpose thermoplastic polymer material, but during combustion there will produce heavy smoke to limit its application and has raised people concern. The transition metal compounds on PVC have good smoke suppression effect. Besides, two or more mixture transition metal compounds have good synergy smoke suppression in PVC. α-MoO3 can promote cross-linking of intermolecular and after reaction to produce carbides. When the carbides content to increase, the oxygen index can also be increased, to reduce combustible component, smoke density and velocity, so as to achieve the purpose of smoke suppression. Molybdenum trioxide flame retardant and smoke abatement performance is flat, so used in cable material the addition amount is large, but it will increase the production cost and the overall performance of the cable will be damaged. If we use composite system, they can collaborate with each other to improve flame retardancy and smoke resistance, but also can save the amount of flame retardants to protect cable material performance and reduce the costs.
Catalytic ApplicationMoO3 has good catalytic performance in some of the basic organic synthesis. The mechanism is exposure in a specific wavelength optical, its surface stimulated to produce electron-hole pairs, in a suitable medium to produce oxidation- reduction reaction, thereby to decompose organic pollutants. MoO3 usually as catalyst used in low-carbon alcohol and partial oxidation.
Gas Sensing Application Gas sensors are used to detect a variety of gases, especially the ambient gas. Metal oxide gas sensor as a "gas - electricity" information conversion device compared to other methods is fast, simple and other good performance, which can be widely used for air quality monitoring, food, flavor, fragrance evaluation and production process control and so on. MoO3 is a wide bandgap semiconductor material and the surface has active site which can react with testing gas, so it has good gas sensing properties. MoO3 film has high sensitiveness on CO, NO2 and other gases. Besides, it has quick response and recovery speed, but as sensitive material can’t long time to stand operating temperature, so the performance should be improved form production processes, carrier and functional particle intercalation and other aspects.
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