Abstract
AbstractIn this work, the effect of humidity on WO3 thin films is studied. Two thin films of higher and lower oxidation states are characterized and studied for their interaction with water molecules on the metal oxide sensing surface. The film with higher oxidation is found to be more immune to humidity effect and hence, further used to reduce the same effect using absorbent filters and Nichrome deposited heater mesh. With the use of a Nichrome heater mesh, by increasing mesh temperature from 30 to 90 °C, there is a 63% reduction in absolute humidity at the sensor die. This in turn stabilizes the NO2 sensor response, by decreasing the humidity dependent (40% RH to 90% RH) peak current variation for 3 ppm NO2 exposure, from 65% to 26%. High‐temperature ageing at a temperature of 90 °C and 90% RH is found to be effective in significantly reducing humidity effect on sensor current output and only 8.4% change in peak current is observed for 3 ppm NO2 at variable humidity, which stabilizes the sensor current drift due to humidity variation.
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