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Metal oxide based gas sensors generally feature high sensitivity but have serious drawbacks in terms of selectivity and reproducibility. The latter is a main obstacle preventing the use of this type of sensors in demanding scenarios, where the determination of concentrations of a specific gas is required. In this contribution we present a novel, reproducible gas sensor approach based on CuO nanoparticles that is capable of determining the hydrogen sulfide concentration down to the ppb level. Employing a thermal modulation scheme and using a percolation phase transition we demonstrate that the sensor response towards H2S is independent on layer morphology. Using six equally produced sensing layers we show that each device reacts the same upon exposure towards H2S thus exhibiting repeatability in a metal oxide based gas sensor.

GS4.4 - A reproducible, metal oxide based gas sensor for ppb level hydrogen sulfide detection