Cobalt titanate–cobalt oxide composite thin films deposited from heterobimetallic precursor

Abstract

A single molecular heterobimetallic complex, [Co2Ti(μ3‐O)(TFA)6(THF)3] (1) [TFA = trifluoroacetate, THF = tetrahydrofuran], was synthesized, structurally and spectroscopically characterized and implemented as a single‐source precursor for the preparation of CoTiO3–CoO composite thin films by aerosol‐assisted chemical vapour deposition (AACVD). The precursor complex was prepared by interaction of Co(OAc)2.4H2O [OAc = (CH3COO−)] with Ti(iso‐propoxide)4 in the presence of trifluoroacetic acid in THF, and was analysed by melting point, CHN, FT‐IR, single‐crystal X‐ray diffraction and thermogravimetric analysis. The precursor complex thermally decomposed at 480 °C to give a residual mass corresponding to a CoTiO3–CoO composite material. Good‐quality crystalline CoTiO3–CoO composite thin films deposited at 500 °C by AACVD and characterized through powder X‐ray diffraction and scanning electron microscopy/energy‐dispersive X‐ray spectroscopy show that the crystallites have a rose‐flower‐like morphology with an average petal size in the range of 2–6 µm. Copyright © 2012 John Wiley & Sons, Ltd.

Dye sensitized solar cell applications of CdTiO3–TiO2 composite thin films deposited from single molecular complex

“…Similarly, the sharp peak originating at 1196 cm À 1 confirms the presence of C-F bonds in complex(1). Meanwhile, the IR spectrum is closely related to those reported previously for similar heterobimetallic compounds[31,33,35] 3.2. Structural analysis of [Cd 2 Ti 4 (μ-O) 6 (TFA) 8 (THF) 6 ] Á 1.5THF(1) …”

“…In continuation of earlier work on house designed AACVD assembly [29][30][31][32][33][34][35], CdTiO 3 -TiO 2 composite thin films were deposited on commercially available FTO conducting glass substrate. Before carrying out the deposition, substrates were cleaned with distilled water, acetone and ethyl alcohol, then placed inside the reactor tube and furnace (CARBOLITE, Model No.…”

“…This strategy of maneuvering materials from molecules is significant for obtaining mixed-metal ceramics and composites. Therefore, in recent years [29][30][31][32][33][34][35], we were particularly involved in targeting titanium based heterometallic complexes as potential SSPs for crystalline multimetallic oxides. For the construction of these complexes, we demonstrated the possibility of utilizing Lewis acid-base interactions with fluorinated and functionalized alcoholic species being used more frequently because of their bridging coordination and enhanced volatility capabilities [29][30][31][32][33][34][35].…”

“…Therefore, in recent years [29][30][31][32][33][34][35], we were particularly involved in targeting titanium based heterometallic complexes as potential SSPs for crystalline multimetallic oxides. For the construction of these complexes, we demonstrated the possibility of utilizing Lewis acid-base interactions with fluorinated and functionalized alcoholic species being used more frequently because of their bridging coordination and enhanced volatility capabilities [29][30][31][32][33][34][35]. These compounds exhibit high volatility, clean, low-temperature decomposition, and retention of heterometallic structures upon sublimation-deposition as well as in solutions of non-coordinating solvents [29][30][31][32][33][34][35].…”

Metal–Organic Derivatives with Fluorinated Ligands as Precursors for Inorganic Nanomaterials

“…(TFA)8 (THF) 6 ]167 and [Co 2 Ti(μ 3 -O)(TFA)6 (THF) 3 ]169 were utilized for the deposition of Fe 2 TiO 5 −TiO 2 and CoTiO 3 −CoO composite thin films, respectively, on glass substrates at 500°C(Figure 45). The X-ray diffractogram of the as-obtained films indicated the formation of a composite of two different types of crystalline oxide phases, pseudobrookite Fe 2 TiO 5 and rutile TiO 2 in the first case, and hexagonal CoTiO 3 and cubic CoO in the second case.…”