The Impact of the Synthesis Temperature on SnO2 Morphology and Sensitivity to CO2 under In-Field Conditions

This letter highlights the role of synthesis temperature over the morpho-structural properties of SnO2. Specific crystalline nanoparticles with quasi-tetragonal and quasi-hexagonal morphologies are faceted, suggesting a high reactivity to atmospheric oxygen. This is a premise for the sensing ability of SnO2 in detecting CO2. The in-field conditions are ensured by dynamic synthetic air flow with variable relative humidity, a wide range of CO2 concentrations and potential interfering gases at their specific detection limits.