Metal-Oxide Gas Sensor Response

This simulator models a real chemiresistive metal-oxide (SnO₂) gas sensor — the type of low-cost sensing element used in household CO/gas alarms and environmental air-quality monitoring nodes. A porous cluster of semiconducting nanograins is rendered in 3D with the electron-depletion shell at every grain-boundary neck; adjusting the target gas concentration, operating temperature and humidity drives a physically grounded model (power-law sensitivity, Arrhenius-activated baseline resistance, gas-specific optimum operating temperature, and first-order response/recovery kinetics) that shrinks or regrows the depletion shells and updates a live resistance-vs-time trace exactly as a real sensor's readout would behave.