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Scheme of the preparation of a capacitive CO2 sensor in four steps. (Step I) Magnetic stirring of the organic PEI and inorganic Silica nanoparticles. (Step II) Spin coating or drop coating of the PEI@silica resulting suspension onto a clean interdigitated transducer on glass substrate. (Step III) Tempering process at 120 °C for 15 min to ensure a complete solvent evaporate from the sensing layer. (Step VI) Capacitive measurement of the prepared CO2 sensor.
