Selectivity and sensitivity nonstoichiometric manganese dioxide doped Cu, Y, and Co

Layers of composites based on manganese dioxide (MnO2-x) with the addition of copper (CuO), yttrium (Y2O3), and cobalt (CoxOy) oxides were obtained and their morphological characteristics were investigated. Gas sensitivity and selectivity of composites to various gases was found. High gas response to hydrogen sulfide for the non-stoichiometric manganese oxide and MnO2-x-based composites was shown. Doping by other oxides enhances the selectivity of the layers to other gases. The gas response increasing to acetonitrile for the MnO2-x/CuO layer was achieved. The introduction of yttrium oxide into MnO2-x significantly increases the sensitivity to formaldehyde and sulfur dioxide. The presence of copper and yttrium oxides in the MnO2–x layer enhances the gas response to ethanol vapors. The MnO2-x/CoyOz composite demonstrates selectivity to hydrogen sulfide compared to other gases.