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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Dependence of sensor response of (a) pure Ga2O3-based materials annealed at 900 °C and (b) 1% mol Nb-doped Ga2O3-based materials annealed at 900 °C at different working temperatures towards acetone 20 ppm in dry air and in air with relative humidity (RH) 2%, 30% and 60%.