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Abstract: Polycrystalline WO3 films were fabricated through thick film technology. Stimulated temperature measurements showed that the intergranular Schottky barrier is not high enough to apply the depletion approximation to evaluate the fundamental parameters related to the sensing properties. Therefore, a semi-analytical approach to the Poisson''s equation with the complete charge density was chosen. As a result, we could estimate the dependence on frequency of both apparent permittivity and depletion region width by impedance spectroscopy. [Copyright &y& Elsevier]

We used SnO2 gas sensors for monitoring ethylene in the range of interest for fruit ripening. The effect of atmospheric humidity on the sensor conductance and response towards ethylene was quantitatively measured. An algorithm for humidity compensation of the sensor’s response was developed and applied to experimental data. The results of our analysis proved useful for the application of chemoresistive sensors for agro-alimentary monitoring. [Copyright &y& Elsevier]