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We present a new CO2 IR sensor concept for indoor air quality (IAQ) combining infrared detection and CO2 sorbent material. Different CO2 sorbent materials were screened and polyethyleneimine cross-linked with glutaraldehyde shows the best sorption performance. CO2 sorption into/desorption from PEI layers was monitored at different CO2 concentrations, temperatures and humidities by in-situ transmission...
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