Study of interactions between oxygen and tin dioxide

The most meaningful resnlts were obtained using mechanically sintered tin oxide samples which were thermally treated at 500°C. The electrical contact is a back-side contact - relative to the sintered pellet - and it is made of gold paste. 

An evolntion snch as this one is typical of complex kinetic processes. This one can be attribnted to the adsorption-diffusion of the oxygen species in the material. 

To ejqrlain these resnlts along the entire curve, it is necessary to rigorously deal with this kinetic system by eliminating any simplifying hypotheses, particularly that of stationary conditions. 

These results confirm the complexity of the surface phenomena involved during such interactions, and therefore also confirms that some of the gas sensors use such materials. 

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