Ag-Modified Porous Perovskite-Type LaFeO 3 for Efficient Ethanol Detection.

Perovskite (ABO 3 ) nanosheets with a high carrier mobility have been regarded as the best candidates for gas-sensitive materials arising from their exceptional crystal structure and physical-chemical properties that often exhibit good gas reactivity and stability. Herein, Ag in situ modified porous LaFeO 3 nanosheets were synthesized by the simple and efficient graphene oxide (GO)-assisted co-precipitation method which was used for sensitive and selective ethanol detection. The Ag modification ratio was studied, and the best performance was obtained with 5% Ag modification. The Ag/LaFeO 3 nanomaterials with high surface areas achieved a sensing response value (R g /R a ) of 20.9 to 20 ppm ethanol at 180 °C with relatively fast response/recovery times (26/27 s). In addition, they showed significantly high selectivity for ethanol but only a slight response to other interfering gases. The enhanced gas-sensing performance was attributed to the combination of well-designed porous nanomaterials with noble metal sensitization. The new approach is provided for this strategy for the potential application of more P-type ABO 3 perovskite-based gas-sensitive devices.