Nanocrystalline CeO2 as Room Temperature Sensing Material for CO2 in Low Power Work Function Sensors

AbstractHere we propose ceria (CeO2) as a sensing layer material for CO2 in low power consumption work function (ΔΦ) readout gas sensors at ambient temperature. The influence of precipitation agent and synthesis method on the sensing performance was tested with a Kelvin Probe setup. Microwave-assisted synthesis and ammonia as a precipitation agent yielded the most sensitive material. The influence of particle size and structure as obtained from SEM are discussed. First results indicate that only nano-ceria shows a sensitive response towards CO2