Perovskites such as SrTiO3 are interesting for photocatalytic applications due to their structure-related and electronic properties. These properties influenced by the presence of SrCO3 which is often formed simultaneously during hydrothermal synthesis SrTiO3. In this study, SrTiO3-SrCO3 composites with different contents (5–24 wt%) were synthesized. Their morphological, structural, optical inv...

The driving force for coarsening is provided by the excess interfacial free energy. In a system with isotropic interface energies, classical coarsening theories can predict the evolution of the sizes of spherical crystals. However, if the interfaces are anisotropic, crystal growth and shrinkage may be limited by the surface attachment/detachment rate, the motion of ledges, or the nucleation of ...

Shape changes of Ag and Au nanoparticles supported on single crystal reconstructed SrTiO3(001) (111) substrates were investigated using scanning tunneling microscopy. Both metals nucleate as multiply twinned particles (MTPs) transform into face-centered-cubic crystals (SCs) beyond a critical volume. On SrTiO3(001)-c(4 × 2) the volumes are measured 141 ± 51 nm3 for 107 23 Au, whereas SrTiO3(111)...

SrTiO3/epoxy nanocomposites are prepared using the facile solution-processing technique by incorporating SrTiO3 nanoparticles with different weight fractions into the epoxy resin host. The morphology of the nanoparticles and composites, as well as the thermal conduction characteristics and electrical properties of the composites were investigated via conventional testing methods. The thermal co...

Hydrogen has a significant impact on the structural and electronic properties of metals, insulators, and semiconductors. Despite the prevalence of hydrogen, little is known about its behavior in oxides such as strontium titanate (SrTiO3). In this work, hydrogen-related defects in SrTiO3 were investigated using infrared absorption spectroscopy. Two local vibrational modes (LVMs) are observed at ...

We report on growth and physical properties of vanadium dioxide (VO2) films on model conducting oxide underlayers (Nb-doped SrTiO3 and RuO2 buffered TiO2 single crystals). The VO2 films, synthesized by rf sputtering, are highly textured as seen from X-ray diffraction. The VO2 film grown on Nb doped SrTiO3 shows over two orders of magnitude metal–insulator transition, while VO2 film on RuO2 buff...

We demonstrate the formation of a ferromagnetic two-dimensional dxy electron sheet strictly confined to the TiO2 interface layer in LaAlO3/SrTiO3 heterostructures. Based on first-principles density functional calculations we show that the complex subband structure of the two-dimensional electron gas (2DEG) generated at the LaO/TiO2 (001) interface is universal, and almost independent of the SrT...

We report Raman study of oxygen-reduced single crystal strontium titanate. Oxygen reduction leads to the appearance of the forbidden first order Raman peaks, as well as new spectral features attributed to the local vibrational modes associated with oxygen vacancies. This assignment is supported by ab initio calculations of phonon modes in SrTiO3 with introduced oxygen vacancies. Raman studies o...

Recent results of Raman spectroscopy studies of lattice dynamics and phase transitions in ferroelectric thin films and superlattices are reviewed. Raman studies of SrTiO3, BaTiO3, and BaxSr1−xTiO3 thin films in comparison to corresponding single crystals are presented; essential differences in the lattice dynamics behavior of thin films and single crystals are discussed. Application of ultravio...

We have examined the growth of thin Pt films on the polar SrTiO3(111) surface using both experimental and theoretical methods. Pt films were grown on both as-received and treated substrates in a UHV chamber using electron beam evaporation, and they were characterized with x-ray and low-energy electron diffraction and atomic force microscopy. The nature of the substrate surface strongly influenc...