Fabrication of CoTiO₃–TiO₂composite films from a heterobimetallic single source precursor for electrochemical sensing of dopamine

Abstract

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.

Synthesis, characterisation and water–gas shift activity of nano-particulate mixed-metal (Al, Ti) cobalt oxides

“…In contrast to the Raman spectrum of the calcined cobalt aluminate sample, the synthesised and calcined cobalt titanate matches with published spectra for CoTiO3 33,[43][44][45] with major peaks at 240, 270, 339, 388, 617, and 687 cm -1 (Figure 2). However, once again the Raman spectra in the literature are contradictory.…”

The flux growth of single-crystalline CoTiO3 polyhedral particles and improved visible-light photocatalytic activity of heterostructured CoTiO3/g-C3N4 composites

“…Cobalt titanate (CoTiO 3 ), as a classical ilmenite-type oxide with the corundum-type structure of A 2 O 3 sesquioxides, has been studied extensively owing to its potential applications such as in pigments, 1 catalysts, 2,3 sensors, 4,5 magnetic recorders, 6 high-k gate dielectric ceramics, 7 adsorbents, 8 and even lithium-ion batteries. 9 In particular, in recent years, CoTiO 3 has received enormous attention in the fields of photocatalysis and photochemistry because of its narrow band gap (∼2.25 eV), suitable electronic band structure, strong visible-light absorption and high stability.…”

Tailored Synthesis of Coral‐Like CoTiO3/Co3O4/TiO2 Nanobelts with Superior Lithium Storage Capability

“…The mole ratio of CoTiO 3 and TiO 2 in CCTNBs, integrating the fitted area, is approximated to 2.21:1 in accordance with the analysis of Rietveld refinements. Moreover, the high‐resolution spectrum of O 1s (Figure e) displaying four distinct peaks at 529.03, 530.04, 531.19, and 532.38 eV are assigned to typical Ti—O, Co—O, lattice oxygen, and adsorbed oxygen, respectively …”