Abstract
Under certain conditions polyethylene coatings can be peeled off from steel substrates together with a previously formed oxide scale. After a certain oxidizing treatment (ageing) and an ohmic contacting, the obtained PE/FeO x -compound foil serves as an excellent humidity sensor. The composition of the iron oxide layer of said sensor-active compound foil was analysed by Mössbauer spectroscopy. This layer was found to consist of hematite (ca 30%) and off-stoichiometric spinel Fe3−x O4 compounds (ca 70%). The content of the vacancies [1,2] nearly doubles with oxidizing treatment. This effect corresponds fairly to the conductivity and the sensor properties of the samples, respectively.
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Mehner, H., Friedrich, S. & Thiessen, K.P. Mössbauer study of PE/FeO x -based humidity sensors. Hyperfine Interact 57, 1997–2000 (1990). https://doi.org/10.1007/BF02405755
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DOI: https://doi.org/10.1007/BF02405755