Review of Ionic-Motion-based Chemimemristive Gas Sensors using Metal-Oxide Semiconductors
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Gas sensors are crucial for environmental monitoring, industrial safety, and healthcare, yet conventional metal-oxidechemiresistive devices require elevated temperatures (150–400°C) to activate surface oxygen redox reactions. Although approachessuch as catalytic functionalization, UV illumination, and two-dimensional materials have been explored for room-temperatureoperation, they remain limited by incomplete recovery, poor selectivity, and instability. This review introduces ionic-motion-basedchemiresistive sensors as a fundamentally different paradigm for room-temperature sensing. Three representative mechanisms arehighlighted: proton conduction in hydrated layers, oxygen-vacancy migration in resistive-switching devices, and ion gating viaelectrolytes. These strategies not only enable efficient, low-power detection under ambient conditions but also open emergingopportunities, including memristive memory effects and neuromorphic olfactory functions. Ionic transport, therefore, provides apromising foundation for the development of next-generation, multifunctional gas sensors.
Abstract
Gas sensors are crucial for environmental monitoring, industrial safety, and healthcare, yet conventional metal-oxidechemiresistive devices require elevated temperatures (150–400°C) to activate surface oxygen redox reactions. Although approachessuch as catalytic functionalization, UV illumination, and two-dimensional materials have been explored for room-temperatureoperation, they remain limited by incomplete recovery, poor selectivity, and instability. This review introduces ionic-motion-basedchemiresistive sensors as a fundamentally different paradigm for room-temperature sensing. Three representative mechanisms arehighlighted: proton conduction in hydrated layers, oxygen-vacancy migration in resistive-switching devices, and ion gating viaelectrolytes. These strategies not only enable efficient, low-power detection under ambient conditions but also open emergingopportunities, including memristive memory effects and neuromorphic olfactory functions. Ionic transport, therefore, provides apromising foundation for the development of next-generation, multifunctional gas sensors.