Conductivity in SnO2 polycrystalline thick film gas sensors: Tunneling electron transport and oxygen diffusion

Study of the oxygen vacancies changes in SnO2 polycrystalline thick films using impedance and photoemission spectroscopies

“…This doping value is similar to that deduced from the measured conductivity reported in Ref. 21, which is remarkable considering all the approximations involved in our calculations. Note that the change in capacitance cannot be due to a barrier lowering, as this would imply a change in conductivity not compatible with the conductivity results of Fig.…”

“…In Schottky barrier difference of 0.07 eV with a slightly higher barrier for the S H2 sample, confirming our previous findings. 21 These results indicate that, regardless of the sample treatment, which leads to very different conductivities, surfaces under vacuum at room temperature present the same Schottky barrier height.…”

“…We have recently reported a barrier height of 0.69 eV for this type of samples. 21 Given this barrier height, doping after the heating should be N d % 1.1 Â 10 25 m À3 . This doping value is similar to that deduced from the measured conductivity reported in Ref.…”

La0.5Sm0.5FeO3: a new candidate for magneto-electric coupling at room temperature

“…6a. The capacitance is not very affected by temperature in this range which are consistent with previously reported results in polycrystalline semiconductors [29]. As it was predicted for Eq.…”

Identification of the Mechanism of Electrocatalytic Ozone Generation on Ni/Sb-SnO2

“…We attribute the increase in mass to the reversible uptake of oxygen at the crystallite boundaries 50 : it is generally accepted that oxygen adsorbs on the surface of SnO2, and can then diffuse into the inner grain boundary (i.e. crystallite) surfaces of porous SnO2 46,51 . The adsorbed O2 that was initially gained up to 350 -500 °C is then lost on heating to 900 °C, with additional loss of oxygenpossibly due to oxygen desorbing from the crystallite surfaces within the grains.…”