Gas Sensing Response Principle of WO3-based Gas Sensors (I)

Details: Category: Tungsten Information; Published on Thursday, 05 February 2015 17:18

The WO3-based gas sensors operate on the principle that the sensor’s resistance or conductivity changes in the presence of target gases. When the gas sensing devices exposure under target gases, the gas molecules are adsorbed on the surface of WO3 and electron transfer occurs between WO3 and the adsorbent. As a result, a depletion or accumulation of charges occurs on the surface. Following that variation of surface potential barrier induces a change in the resistivity or conductivity. Thus, this change suggests that WO3 produces response to the target gases.

It is common to evaluate gas sensing characteristics by the parameters like sensitivity, response time, recover time, gas concentration and working temperature. The ideal sensor materials should be of high sensitivity to target gases, short response and recover time, low gas concentration and working temperature.

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