Thick Tungsten Oxide Gas Sensors Modified Atmosphere

Screen printing method using tungsten oxide powder was prepared by acid decomposition into thick tungsten oxide gas sensors, and has carried out the reduction and oxidation treatment in an atmosphere of hydrogen and air, systematic study of hydrogen concentration and temperature on the rate of oxidation sensitive membrane morphology, structure and CO gas sensing performance. The results showed that the hydrogen reduction - after air oxidation, the sensitive film surface morphology by approximately spherical particles into the rod-shaped or cluster rules smooth surface quadrangular prism open at both ends, while the crystal structure is not changed. Sensitive membrane of CO sensitivity (Rair / RCO) with increasing concentration of CO and the test temperature is higher. Compared with the no sensitive membrane modified atmosphere, reducing atmosphere by 10% H2 in air to 600 ℃ sensitive membrane after 5 ℃ / min oxidation of CO with maximum sensitivity, it is to 3.8 × 10-5CO 13.3-fold increase in sensitivity. Sensitive membrane through modified atmosphere can significantly improve the sensitivity of CO can.

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