Synthesis of Stoichiometric SrTiO3 and Its Carrier Doping from Air-Stable Bimetallic Complexes

We demonstrate the synthesis of perovskite oxide SrTiO₃ with ideal cation stoichiometry and homogeneous La doping using air-stable Sr-Ti and La-Ti bimetallic peroxo complexes with a 1:1 cation ratio. Phase-pure SrTiO₃, La₂Ti₂O₇, and LaTiO₃ were successfully synthesized by thermal decomposition of those complexes. La-doped SrTiO₃ was obtained by mixing the Sr-Ti and La-Ti complexes in an acid solution, followed by thermal decomposition. La-doped SrTiO₃ showed systematic chemical trends in the lattice constant and electrical conduction. Not only those bulk polycrystals but also cation-stoichiometric SrTiO₃ epitaxial thin films were grown with an atomically flat surface from the Sr-Ti complex.

The use of mixed-metal single source precursors for the synthesis of complex metal oxides

This Feature Article highlights the use of mixed-metal single source precursors to directly access useful complex metal oxide materials.

Wheel-Like Icosanuclear Peroxotitanate-A Stable Water-Soluble Catalyst for Oxygen Transfer Reactions

Water-soluble wheel-like icosanuclear peroxotitanate K₁₆[Ti₂₀(μ-O)₈(HO₂)₈(O₂)₁₂( R, R-tart)₁₂]·52H₂O (1) chelated by tartrate has been successfully isolated. As the largest peroxotitanate reported, {Ti₂₀} features 20 (hydro)peroxo groups with three kinds of coordination modes in μ-η¹:η², μ-η²:η², and η² fashions. The cluster is stable in solution and solid states. It has been tested for the catalytic oxidations of methyl phenyl sulfide and pyridine with hydrogen peroxide, respectively, which shows reversible elimination and the addition of peroxo groups. This provides a rare example of well-characterized titanium peroxide for homogeneous catalysis and mechanism research.

Fabrication of CoTiO3-TiO2 composite films from a heterobimetallic single source precursor for electrochemical sensing of dopamine

Cobalt titanate-titania composite oxide films have been grown on FTO-coated glass substrates using a single-source heterometallic complex [Co2Ti4(μ-O)6(TFA)8(THF)6]·THF () which was obtained in quantitative yield from the reaction of diacetatocobalt(ii) tetrahydrate, tetraisopropoxytitanium(iv), and trifluoroacetic acid from a tetrahydrofuran solution. Physicochemical investigations of complex have been carried out by melting point, FT-IR, thermogravimetric and single-crystal X-ray diffraction analyses. CoTiO3-TiO2 films composed of spherical objects of various sizes have been grown from by aerosol-assisted chemical vapor deposition at different temperatures of 500, 550 and 600 °C. Thin films characterized by XRD, Raman and X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis have been explored for electrochemical detection of dopamine (DA). The cyclic voltammetry with the CoTiO3-TiO2 electrode showed a DA oxidation peak at +0.215 V while linear sweep voltammetry displayed a detection limit (LoD) of 0.083 μM and a linear concentration range of 20-300 μM for DA. Thus, the CoTiO3-TiO2 electrode is a potential candidate for the sensitive and selective detection of DA.

Fabrication of CuO–1.5ZrO2 composite thin film, from heteronuclear molecular complex and its electrocatalytic activity towards methanol oxidation

CuO–1.5ZrO₂ composite electrodes fabricated from a single source precursor [Cu₄Zr₆(μ-O)₈(dmap)₄(OAc)₁₂]·H₂O have been utilized for the oxidation of methanol.

Enhancement of the physicochemical properties of polyurethane–perovskite nanocomposites via addition of nickel titanate nanoparticles

Perovskite is integrated by in situ addition with polyurethane (PU) to form unprecedented nanocomposite films (~1.5 mm). Trace amount of NiTiO₃ NPs (0.5 wt%) has been added to enhance the physicochemical, electrical, optical and magnetic properties.

Nitrite ion sensing properties of ZnTiO3–TiO2 composite thin films deposited from a zinc–titanium molecular complex

ZnTiO₃–TiO₂ composite thin film electrode has been fabricated by AACVD method and tested for electrochemical nitrite ion detection.

Synthesis and characterization of Eu3+, Ti4+ @ ZnO organosols and nanocrystalline c-ZnTiO3 thin films aiming at high transparency and luminescence

By exploiting colloidal properties, such as transparency, rheology and versatile chemistry, we propose to synthesize new photonic nanomaterials based on colloidal solutions and thin films. This contribution highlights our efforts to elaborate and to characterize nanostructures based on the ZnO-TiO₂ system. Using a recently developed sol-gel route to synthesize new Ti⁴⁺@ZnO organosols, we were able to prepare, at relatively low temperature (400 °C) and short annealing time (15 min), highly transparent, luminescent, nanocrystalline Eu³⁺ doped c-ZnTiO₃ thin films. The organosols and thin films were characterized with UV-visible-near infrared absorption, ellipsometry, photoluminescence spectroscopy, dynamic light scattering, x-ray diffraction and scanning electron microscopy.