Electrical studies on oxygen ionosorption at ambient pressure on SnO2(In) thin films

Thermal analysis studies of oxygen chemisorption on nanocrystalline SnO2

“…According to Sberveglieri et al, 6 the observed conductance changes with temperature in the range between 160 and 400°C can be explained in terms of the adsorption and desorption processes of oxygen species on the SnO 2 surface. The initial conductivity decrease with temperature can be attributed to O 2 − ionosorption which results in a reduction of the number of conduction electrons.…”

“…This is ascribed to the adsorption of new ionic species like O − or O 2− . Sberveglieri et al 6 also pointed out that the conductance would increase with temperature again due to the desorption of O − or O 2− ions. There would be a second conductance minimum corresponding to the high-temperature exothermal peak in DTA measurement (see Fig.…”

“…2 Semiconductor gas sensors operate on the principle that gas molecules react with the O 2 − and O − (or O 2− ) ions previously adsorbed onto the sensor surfaces. [3][4][5][6][7] These reactions lower the surface Schottky barrier formed by the ionosorbed oxygen species and consequently the electrical resistance decreases. It is therefore very important to know the oxygen adsorption and desorption conditions in order to choose proper working temperatures for gas sensors and their exact processing parameters.…”

“…It is therefore very important to know the oxygen adsorption and desorption conditions in order to choose proper working temperatures for gas sensors and their exact processing parameters. Unfortunately, although the influence of oxygen on electronic properties of SnO 2 has been widely studied, [4][5][6][7] concrete experimental data about the heats of adsorption for O 2 − and O − (or O 2− ) on surfaces of SnO 2 are still lacking.…”

Recent Advances in Preparation and Applications of 3D Transition Metal Oxides Semiconductor Photonic Crystal

“…When exposed to external light, heat, or doping into trace amounts of active impurities, their conductivity tends to change significantly. [22,23] Semiconductor materials are widely applied in household appliances, communications, equipment manufacturing, aerospace, and other fields. Commonly used semiconductor materials mainly include transition metal oxides (TMOs) (such as TiO 2 , ZnO, Fe 2 O 3 , WO 3 , Cu 2 O, etc.…”