A General Synthetic Route to High‐Quality Perovskite Oxide Nanoparticles and Their Enhanced Solar Photocatalytic Activity

Abstract The main limitations of current methods for synthesizing perovskite oxide (ABO 3 ) nanoparticles (NPs), e.g., the high reagent costs and sophisticated equipment, the long time and high‐temperature processing, or multiple post‐processing and thermal treatment steps, hamper their full study and potential application. Here, we use a facile low temperature (50 °C) chemical bath synthesis and only one annealing step to successfully produce high phase purity and crystalline quality nano‐shaped rare‐earth‐based REMO 3 NPs (RE=La, Nd, Sm, Gd; M=Fe, Mn, Al). We also show the versatility of this approach by fabricating La 0.7 Sr 0.3 MnO 3 solid solution and non‐RE‐based BiFeO 3 perovskite. To assess the potential of the as‐prepared REFeO 3 and REMnO 3 NPs, they are used for photocatalytic degradation of the norfloxacin antibiotic and show high efficiency. We believe this easy, robust, versatile, and general route for synthesizing ABO 3 ‐based NPs can be further explored in the vast perovskite family and beyond.