Due to its excellent photocatalytic activity and piezoelectricity properties, SrTiO3 has attracted much attention in environmental photocatalysis, electronic and ceramic industries. SrTiO3 nanoparticles were synthesized by one-step oleic acid-assisted hydrothermal process using anatase TiO2 and Sr(OH)2?8H2O in this work. SrTiO3 nanoparticles were analyzed. The effects of oleic acid concentration, reaction time and Sr/Ti molar ratio on the properties of SrTiO3 nanoparticles were researched, photocatalytic property of the prepared SrTiO3 catalyst was investigated by the degradation of methylene blue. The results showed that perovskite phase cubic SrTiO3 nanoparticles with uniform size and regular morphology. The grain size of SrTiO3 nanoparticles increased with the increase of reaction time and Sr/Ti molar ratio, while decreased with the increase of oleic acid concentration. The agglomerate phenomenon of SrTiO3 nanoparticles became weaken and perovskite phase cubic SrTiO3 nanoparticles with regular morphology were obtained with the addition of oleic acid. When the Sr/Ti molar ratio was 0.75, the purity of the product was high. The influence of oleic acid concentration, reaction time and Sr/Ti molar ratio on microstructures of SrTiO3 nanoparticles could be explained by interparticle force, Ostwald ripening and crystal nucleation theory, respectively.
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