Electrosteric colloidal stabilization for obtaining SrTiO3/TiO2 heterojunction: Microstructural evolution in the interface and photonics properties

Electrosteric colloidal stabilization for obtaining SrTiO₃/TiO₂ heterojunction: Microstructural evolution in the interface and photonics properties

Abstract: Researches on solids heterojunctions has proven to be an important field for technological applications due to synergism achieved by interface phenomena. In this work, we present an understanding of SrTiO₃/TiO₂ interface and its effects on structural and microstructural characteristics, and relate them to photoluminescence properties of heterojunctions obtained by a simple method. It was observed that SrTiO₃ proportion directly influences the structural order-disorder, as observed by X-Ray diffraction, Raman spectroscopy and Transmission electron microscopy. Photoluminescence behavior of heterojunction with 1% of SrTiO₃ showed a shift to blue emission region compared to TiO₂, and enhanced of emission intensity compared to SrTiO₃, resulted from defects generated by interface effects, attracting possible applications on selective color emitter. Therefore, we conclude that in same materials phases, nature and concentration of structural defects has strong dependence of SrTiO₃ concentration, which leads to different photoluminescence properties.

Authors: Rafael A. C. Amoresi, Vinícius Teodoro, Guilhermina F.Teixeira, Maximo S.Li, Alexandre Z. Simões, Leinig A. Perazolli, ElsonLongo & Maria A. Zaghete.