P5.4 - Low-cost chemical gas sensors for selective formaldehyde quantification at ppb-level in the field

M. Bastuck, A. Schütze, D. Puglisi, P. Möller, A. Lloyd Spetz, M. Andersson & W. Reimringer
Data from a silicon carbide based field-effect transistor were recorded over a period of nine days in a ventilated school room. For enhanced sensitivity and selectivity especially to formaldehyde, porous iridium on pulsed laser deposited tungsten trioxide was used as sensitive layer, in combination with temperature cycled operation and subsequent multivariate data processing techniques. The sensor signal was compared to reference measurements for formaldehyde concentration, CO2 concentration, temperature, and relative humidity. The results show a...