Sonochemical synthesis of SrTiO3/TiO2 heterojunction material

Abstract

A composite SrTiO3/TiO2 heterojunction photocatalyst was prepared by sonication methods. The heterojunction material SrTiO3/TiO2 was synthesized using an ultrasonic cleaning bath for 4 hours, by mixing SrTiO3 and TiO2 with variations in the comparison of mol 1:1, 1:2, 1:4 and 1:6. Characterization using XRD shows heterojunction material consisting of SrTiO3 and TiO2 anatase without any impurities, with the morphological surface observed using SEM indicating the agglomerated small particles. The bandgap of heterojunction material with a variation in mol SrTiO3: TiO2 of 1:1, 1:2, 1:4 and 1:6 are 3.11; 3.09; 3.07; and 3.07 eV respectively. The all of bandgap is lower than the SrTiO3 and TiO2 bandgap, i.e. 3.2 eV.