Gas sensing with yolk-shell LaFeO3 microspheres prepared by facile hydrothermal synthesis

A facile hydrothermal route with the subsequent annealing and chemical etching process to the synthesis of yolk-shell LaFeO3 microspheres without any template is described. Transmission electron microscopy (TEM) images of the products obtained at different hydrothermal reaction time revealed the formation mechanism of yolk-shell LaFeO3 microspheres. Gas sensing devices were fabricated from the as-prepared samples, and their gas sensing properties were tested for response to various reducing gases. The sensor based on yolk-shell LaFeO3 microspheres exhibited high response and good selectivity toward acetone at 225 degrees C, giving a response of 25.5-100 ppm. (C) 2017 Published by Elsevier B.V.