SCHEDULED MAINTENANCE
Fabrication of CoTiO3–TiO2 composite 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 (1) 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 1 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 1 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.
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