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  • Sol-gel vanadium oxide thin films for a flexible electronically conductive polymeric substrate
    Hajzeri, Metka ...
    Vanadium oxide nanocrystalline films were prepared by spin-coating from vanadium (V) oxoisopropoxide sol and thermally treated at 150 °C, in order to deposit them on PET-ITO substrates. The sols were ... made from either isopropanolor its mixture with n-butanol, both exhibiting similar rheological behaviour and a viscosity of the order of magnitude of 10-3 Pa s. A cross-hatch test revealed the excellent adhesion of these films on the ITO surface and delamination occurred preferentially at the ITO-plastic interface when the films were subjected to deliberate bending. The electrochemical and optical properties of the vanadium oxide films were analysed using in-situ UV-vis absorbance spectroelectrochemistry. The response was correspondingly lower than with films deposited on FTO-glass. Ex-situ IR reflection-absorptionspectroscopy showed that vanadyl V-OA and superimposed bridging V-OB-V and 3V-OC bands appear at lower frequencies compared to crystalline V2O5, due to the hydrated nanocrystalline structure. An intercalation induced red-shift of the vanadyl mode and the disappearance of the superimposed V-OB-V and 3V-OC bands, but the spectrum was restored to the initial situation after deintercalation. The modulation of polaron absorption that extends from the near to mid-IR spectral region up to 2000 cm-1 was not visible due to transfer of the films from electrochemical cell to the IR spectrometer. The electrochromic properties of the vanadium oxide films deposited on PET-ITO substrate were tested in a liquid electrolyte-based cell with an electrochromically active PEDOT film and 1 M LiClO4/propylene carbonate electrolyte.
    Source: Proceedings of the 9th International Meeting on Electrochromism, September 5-9, 2010, Bordeaux, France (Vol. 99, iss. 1, 2012, str. 62-72)
    Type of material - conference contribution
    Publish date - 2012
    Language - english
    COBISS.SI-ID - 4648218
    DOI

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