Abstract
Evaluation of Oxygen Adsorption Based on the Electric Properties of SnO2 Semiconductor Gas Sensors
Highlights
Tin dioxide (SnO2) is the main semiconductor used to detect combustible gases in commercial applications as well as in research on gas sensors. Such resistive-type gas sensors have been utilized as gas leakage detectors and for air pollution monitoring,(1–3) and can be used as detectors for breath gases.[4,5] Combustible gases are typically detected by measuring the change in the electric resistance of SnO2 particles
SnO2 particles adsorb the dissociative oxygen with negative charge, and an electron depletion region is formed on the particle surface
Oxygen adsorption increases the electric resistance, whereas a surface combustion reaction decreases the electric resistance of SnO2 particles
Summary
Tin dioxide (SnO2) is the main semiconductor used to detect combustible gases in commercial applications as well as in research on gas sensors. Such resistive-type gas sensors have been utilized as gas leakage detectors and for air pollution monitoring,(1–3) and can be used as detectors for breath gases.[4,5] Combustible gases are typically detected by measuring the change in the electric resistance of SnO2 particles. SnO2 particles adsorb the dissociative oxygen with negative charge, and an electron depletion region is formed on the particle surface. Combustible gases consume the adsorbed oxygen via a surface combustion reaction and reduce the electron depletion region. Understanding the oxygen adsorption ability of the SnO2 surface is very important for gas sensors
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