WO3 is the optimal sensing material for producing O3 gas sensor by detecting changes in surface conductance after tungsten trioxide film on sensor contacts the measured gas - O3. As we all know, O3 has been widely used in disinfection and sterilization, sewage treatment and other aspects.
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However, excess O3 in the air (when the relative volume fraction exceeds 10^-7) will do harm to the human body and also damage other materials such as clothing and building materials. And it has been causing global environmental issues. Therefore, in some scenes, monitoring O3 in the air is a necessary means. The WO3-based O3 gas sensor having good sensitivity to O3 in the air was developed under the background. Some experts have prepared Co-doped WO3-based gas sensors. The results show that after Co-doping, WO3 changes from n-type to p-type and improves its conductivity in O3 gas.
