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Investigation of IrO2/SnO2 thin film evolution by thermoanalytical and spectroscopic methods

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Abstract

The formation mechanism of thermally prepared IrO2/SnO2 thin films has been investigated under in situ conditions by thermogravimetry combined with mass spectrometry (TG-MS) and infrared emission spectroscopy (IRES). Mixtures of varying composition of the precursor salts (SnCl2·2H2O dissolved in ethanol and IrCl3·3H2O dissolved in isopropanol) were prepared onto titanium metal supports. Then the solvent was evaporated and the gel-like films were heated in an atmosphere containing 20% O2 and 80% Ar to 600°C. The thermogravimetric curves showed that the evolution of the oxide phases take place in several decomposition stages and the final mixed oxide film is formed between 490 and 550°C, depending on the noble metal content. Mass spectrometric ion intensity curves revealed that below 200°C crystallization water, residual solvent, and hydrogen-chloride (formed as a result of an intramolecular hydrolysis) are liberated. The decomposition of surface species (surface carbonates, carbonyls and carboxylates) formed via the interaction of the residual solvent with the precursor salts takes place up to 450°C as evidenced by emission Fourier transform infrared spectrometry.

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Authors and Affiliations

  1. Department of Environmental Engineering and Chemical Technology, University of Veszprém tH-8201 Veszprém, P.O.Box, 158, Hungary

    E. Horváth

  2. Department of Analytical Chemistry, University of Veszprém, H-8201 Veszprém, P.O.Box, 158, Hungary

    J. Kristóf, N. Heider & V. Vágvölgyi

  3. School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box, 2434, Brisbane, Queensland, 4001, Australia

    R. L. Frost

Authors
  1. E. Horváth
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  2. J. Kristóf
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  3. R. L. Frost
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  4. N. Heider
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  5. V. Vágvölgyi
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Horváth, E., Kristóf, J., Frost, R.L. et al. Investigation of IrO2/SnO2 thin film evolution by thermoanalytical and spectroscopic methods. Journal of Thermal Analysis and Calorimetry 78, 687–695 (2004). https://doi.org/10.1023/B:JTAN.0000046128.84995.77

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  • DOI: https://doi.org/10.1023/B:JTAN.0000046128.84995.77

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