An overview of the translation of selective semiconducting gas sensors from first results to automotive exhaust gas monitors to a platform for breath-based diagnostics

Metal oxide-based resistive gas sensors with inherent selectivity to gases exhaled in a human breath were developed in a scalable and affordable manner. The developments in the tailored synthesis and scalable nanomanufacturing of polymorphs of binary metal oxide gas-sensing elements, together with the publication of guidelines from the medical community for the measurement of breath gases in exhaled breath, have opened the pathway for personalized diagnostic breathalyzers, as described here.