Nanoparticulate perovskite‐type LnBO3 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; B = Cr, Fe) oxides are prepared by polyol‐mediated synthesis. X‐ray diffraction is used to confirm the structure of the materials, and scanning electron microscopy is applied to image the sample morphology. The powders are used for the preparation of suspensions that are deposited as thick films on comb‐type Pt electrodes on alumina substrates. Electrical characterization is performed by using high‐throughput impedance spectroscopy. The materials exhibit p‐type semiconductor behavior, and their sensitivity towards H2, CO, NO, NO2, and propylene in a temperature range from 200 to 500 °C is analyzed. In addition, the time‐resolved response of the LnFeO3 materials is investigated. A correlation between the Ln–O binding energy and the sensing properties is observed.

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Several perovskite‐type nanosized oxides were prepared via polyol‐mediated synthesis. The crystallinity of the materials was analysed by X‐ray diffraction (XRD). While the “as synthesized” materials are amorphous or show very poor crystallinity, highly ordered materials could be obtained by annealing at 700 °C. Morphology of the materials was analysed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Particle size of the materials lay between 20 and 200 nm.