High throughput screening of the propylene and ethanol sensing properties of rare-earth orthoferrites and orthochromites

Perovskite-type LnMO3 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; M = Cr, Fe) oxides were prepared by the polyol mediated synthesis. Thick films of the prepared materials were electrically characterised using high throughput impedance spectroscopy (HT-IS). All samples showed p-type semiconductivity. Ethanol and propylene were used to test the gas sensing behaviour in a temperature range from 200 to 500 °C. A correlation between the (Ln–O) binding energy and the sensing properties is observed.