Yellow Tungsten Oxide Gas Sensor

tungsten trioxide photo
gas sensor picture Inquiry & Feedback

Yellow tungsten oxide (WO3) is an n-type transition metal semiconductor, which can be used as a semiconductor gas sensor. WO3 has been considered as one of the most promising novel oxide gas sensing materials for the detection of NOx, SOx, NH3, CO, hydrogen and hydrogen sulfide and other gases. The principle of WO3 is that when it is exposed to the specific gas, oxygen is adsorbed from the air as an electron acceptor states in the band gap material of tungsten trioxide, surface reaction leading to the acceptor states in the portion of the surface coverage changes, causing the change of electrical conductivity, thus to realize detecting specific gas concentration.

There are many fruits about research of tungsten trioxide gas sensor, such as:
1. WO3 thin film gas sensor, which is depended on target of tungsten, and prepared by opposite target magnetron sputtering method on the substrate covered with interdigitated platinum electrode, and finally obtained after heat treatment;
2. WO3 hydrogen optical fiber sensor, which takes multi-mode silicon dioxide as the carrier, and tungsten is deposited on the fiber head by radio-frequency sputtering, then corroded into tungsten acid film, and then by controlling a certain calcination temperature to obtain yellow tungsten oxide hydrogen optical fiber sensor;
3. Porous silicon substrate WO3 nano-thin film gas sensor, which combines the advantages of porous silicon and WO3 to form a gas sensor with properties of low working temperature (room temperature) and high sensitivity;
4. Mesoporous WO3nanofibers with uniform distribution of Pt, Pd and Rh, which has a great potential in the diagnosis of disease reliability;
5. Tungsten trioxide nanowire CO gas sensor, which takes analysis of pure sodium tungstate dihydrate (Na2WO4.2H2O) as the raw material, adding potassium sulfate (K2SO4) to prepare the yellow tungsten nanowire, and then making the sensitive slurry coated on the interdigitated silver electrode alumina substrate, finally heat treatment to obtain.

Related Products:

APT

Ammonium Paratungstate

Ammonium paratungstate (APT) is an important intermediate compounds of tungsten hydrometallurgical process, appearance is white crystalline powder, insoluble in water, soluble in alcohol and ether.
ammonium metatungstate

Ammonium Metatungstate

Ammonium metatungstate(AMT) is an important intermediate compounds of tungsten hydrometallurgical process, appearance is white crystalline powder, solubility in water is the largest in the tungsten compounds which over 300g WO3/100ml H2O (in 25℃).
sodium tungstate

Sodium Tungstate

Sodium tungstate, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.
tungstic acid

Tungstic Acid

Tungstic acid refers to hydrated forms of tungsten trioxide, WO3. The simplest form, the monohydrate, is WO3.H2O, the dihydrate WO3.2H2O is also known. The solid state structure of WO3. H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.
blue tungsten oxide

Blue Tungsten Oxide

Blue tungsten oxide refers to a class of dark blue compound containing tungsten (Ⅵ) and tungsten (V) mixed valence state. Blue tungsten oxide is the product of reductant and tungsten compounds. Composition of blue tungsten oxide is complex, among which there are also intermediate oxides like WO2 and W4.
cesium tungstate bronze

Cesium Tungsten Bronze

Cesium tungsten bronze is inorganic nano material with good property in absorbing near-infrared with uniform grain size and dispersibility, it has strong absorbing function in near-infrared area with wave length 800~1200nm, also has high transmittance in visible light area with wave length 380~780nm.