Research Status and Prospects of WO3-based Gas Sensor

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Category: Tungsten Information
Published on Thursday, 05 February 2015 18:17
Written by cq
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Tungsten oxide is usually used to fabricate gas sensor to monitor the toxic gases or some exhaust gases in the air. The gas sensing properties of WO3 may be improved by optimizing itself characteristics (size, surface morphology, shape and crystalline structure) . Thus the hydrothermal method for preparation of WO3 attracts considerable attentions. At present, most of work has been devoted to the improvement of sensitivity，the reducing of concentration of target gas and the increase of gas types.
 
In fact, these aspects all gain well advancement by optimizing the grow method, dopant and electrode. However,  the WO3-based gas sensor just usually performed well above 200℃. This temperature range limits the wide application of WO3-based gas sensor. Therefore, seeking approaches to reduce the working temperature may be the next goal. On the one hand, seeking new dopant material to change the gas sensing characteristics of WO3 is a common way. On the other hand, controlling the preparation conditions accurately and making use of the very assisting agents to optimize the relative characteristics of WO3 are the technique measures.
 
In addition, change the manner of WO3-based sensors for gases detection. Do not monitor the changes of electrical properties of WO3-based sensors. Recording the changes of optical properties of WO3-based sensors is also used to analyze the gas sensing response. This is because the optical properties will change when the WO3-based sensors exposure under the target gases.
 
 
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