YUN Yong-chol1, HU Ming1, FENG You-cai1. Effect of thickness of WO3 gas sensing thin film on gas response time[J]. 2007, (6): 12-14. DOI: 10.13873/j.1000-97872007.06.005.
Effect of film thickness on the gas response time of thin-film-type gas sensor has been analyzed by deriving an equation from a simple model
and the equation is applied to the sensing behavior of WO3 thin film sensor.It is revealed
from the equation
that the gas sensing property is closely related to gas diffusivity into the film which is a function of film thickness
reactivity of the gas detected with sensing material
operating temperature
etc.The equation derived is well consistent with the experimental results from WO3 thin film sensors and explained their different NH3 sensing behaviors.Finally
a model is suggested
explaining the effect of gas sensing behavior of oxide semiconductor sensor.