Theory of solids/gas mixtures multi-interfaces: Application to the steady state interactions between a sensor array based on metal oxide semiconductor detectors and a mixture of vapours

CO2gas detection properties of a TIO2/Al2O3heterostructure under UV light irradiation

“…It may support the hypothesis that in this case the interface states are also mainly responsible for the barrier. The forward current is enhanced by contact with target gases, which change the amount of chemisorbed oxygen through an oxidative reaction [52][53][54].…”

Modelling of Thermodynamics of Adsorption on Sensor Array Films: Application to the Generalized Multi-Component Adsorption-Model of Langmuir

“…In this case the Eq. (11) can be rewritten by using the relationships (12) In previous work, 9 we have already shown, that the Eq. (15) is valid if and only if i ⊥ f i and i ⊥ h i .…”

“…(6) useful for the treatment of experimental data, we transform it to Eqs. (8), (9), which describe the variation of the response of the sensor array elements as function of the concentrations of gas mixture components at variable temperature in Eq. The Langmuir model is of course over-simplified; most practical surfaces are not uniform and possess adsorption sites that have different potential energies.…”

Synthesis, Characterization and Water Vapor Sensitivities of Nanocrystalline SnO2 Thin Films

“…The Freundlich is an empirical expression that takes into account the heterogeneity of the surface and it can be expressed as follows [4]: R gas corresponds to the electrical resistance in presence of the gas, R air is the electrical resistance in air (baseline), n is the initial gas mole number, eq n is the gas mole number at thermodynamic equilibrium, α is a parameter which includes electrical and thermodynamic quantities, and m is a coefficient.…”