title: 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 () 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.
authors.affiliation: Center of Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum & Minerals, Saudi Arabia.
authors.forename: Muhammad Ali
authors.initials: MA
authors.lastname: Ehsan
authors.affiliation: Department of Chemistry, Faculty of Science, University of Malaya, Lembah Pantai, 50603-Kuala Lumpur, Malaysia. mazhar42pk@yahoo.com.
authors.forename: Rabia
authors.initials: R
authors.lastname: Naeem
authors.affiliation: Department of Chemistry, University of the Pacific, 3601 Pacific Avenue, Stockton, CA 95211, USA.
authors.forename: Hamid
authors.initials: H
authors.lastname: Khaledi
authors.affiliation: Center of Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum & Minerals, Saudi Arabia.
authors.forename: Manzar
authors.initials: M
authors.lastname: Sohail
authors.affiliation: Center of Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum & Minerals, Saudi Arabia.
authors.forename: Abbas
authors.initials: A
authors.lastname: Hakeem Saeed
authors.affiliation: Department of Chemistry, Faculty of Science, University of Malaya, Lembah Pantai, 50603-Kuala Lumpur, Malaysia. mazhar42pk@yahoo.com.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Mazhar
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004298:Dopamine / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D005898:Glass / Q000737:chemistry; D006358:Hot Temperature; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D056951:Photoelectron Spectroscopy; D013059:Spectrum Analysis, Raman; D014025:Titanium / Q000737:chemistry*; D044366:Transition Temperature; D014961:X-Ray Diffraction
chemical_list: C009495:titanium dioxide; D003035:Cobalt; D014025:Titanium; D004298:Dopamine