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Gasochromic Behavior of Sol-Gel Derived Pd Doped Peroxopolytungstic Acid (W-PTA) Nano-Composite Films

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Abstract

The behavior of sol-gel prepared thin films exhibiting a gasochromic effect; i.e., a reversibly change in colour from transparent when in air to blue when in H2, has been studied. The films were prepared from a Pd (PdCl2) doped peroxopolytungstic acid sol using a dip-coating technique. Transmission electron microscopy together with selected area electron diffractrometry revealed that the films consist of monoclinic and hexagonal nanocrystalline grains (∼2–5 nm) embedded in an amorphous phase. This amorphous hydrated phase was established using Infrared (IR) and Raman spectroscopy. Characteristic vibrations observed in the in-situ IR spectra of the coloured and bleached states revealed the presence and the importance of terminal W=O and W—OH2 groups in the colouring of the films. Colouring/bleaching changes of Pd doped W-PTA films observed using in-situ UV-Vis spectroscopy are described in terms of Pd concentration, and the number of reducing/oxidising cycles. The rate of colouring/bleaching is greater for films containing a higher concentration of Pd but the change in the optical density does not increase, i.e., shows saturation.

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Authors and Affiliations

  1. National Institute of Chemistry, Hajdrihova 19, SI-1001, Ljubljana, Slovenia

    B. Orel, U. Opara Krašovec & N. Grošelj

  2. J. Stefan Institute, SI-1000, Ljubljana, Slovenia

    M. Kosec & G. Dražič

  3. Department of Inorganic Chemistry, Hebrew University of Jerusalem, Jerusalem, Israel

    R. Reisfeld

Authors
  1. B. Orel
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  2. U. Opara Krašovec
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  3. N. Grošelj
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  4. M. Kosec
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  5. G. Dražič
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  6. R. Reisfeld
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Orel, B., Krašovec, U.O., Grošelj, N. et al. Gasochromic Behavior of Sol-Gel Derived Pd Doped Peroxopolytungstic Acid (W-PTA) Nano-Composite Films. Journal of Sol-Gel Science and Technology 14, 291–308 (1999). https://doi.org/10.1023/A:1008773614398

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