7.1.3 Breath acetone monitoring by portable Si:WO3 gas sensors

M. Righettoni, A. Tricoli, S. Gass, S. E. Pratsinis, A. Schmid & A. Amann
Breath analysis has the potential for early stage detection and monitoring of illnesses to drastically reduce the corresponding medical costs. Here, a portable acetone sensor consisting of flame-deposited and in-situ annealed, Si-doped epsilon-WO3 nanostructured films was developed. The chamber volume was miniaturized, reaction- and diffusion-limited gas flow rates were identified and sensing temperatures were optimized resulting in low limits of detection and short responses at realistic relative humidities. The acetone content in the breath of...