Tungsten Oxide Ion-Sensitive Membrane

The tungsten oxide film is one of the most compelling ion-sensitive color material having ReO: structure, the crystal structure is actually the ABO3 type perovskite structure in the vacant cation sites A and B into bit W6 +. When there is a positive ion source, plus the electric field will cause positive ions M and electron diffusion and migration in WO3 films. When the WO. When the negative voltage is applied, positive ions are implanted WO3 film, occupy one bit "A" to form a tungsten bronze MxWO3; reverse voltage, the ions are implanted from the WO3 film and the extraction process of extracting the ion implantation is a reversible electric. chemical reaction process.

Ion implantation with the extraction process of the tungsten oxide film, the optical properties of the film (light transmittance, reflectance, absorption rate and refractive index, etc.) and electrical properties will undergo significant changes. For example, as the ion implantation amount X increase, MxWO3 be changed from a semiconductor or insulator having metallic properties, the resistivity can vary from 6 to 01 a occurs in 5X01`ncm range. Accordingly, the film will be in a transparent state (visible light transmittance> 08 W) to dark blue color (visible light transmittance <02%) reversible change between .WO: effect of this ion-sensitive color film in the optical switch smart window (SmratWindow), information displays, gas sensors, pH probes and other fields have broad application prospects.

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