On the pH-sensing properties of differently prepared tungsten oxide filmsol
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In this paper, different preparation routes and designs for pH
sensing metal/metal oxide electrodes are evaluated. Crystallographic
changes in the oxide film are responsible for the pH-sensing capability of tungsten oxide. As the present oxide structure is directly limiting the measuring range, as-received tungsten oxide powders were heat treated to produce polymorphs of WO3, in an attempt to extend the measuring
range. Furthermore, electrochemical oxide covered electrodes ranging from micro- down to nano-dimensions have been implemented. Optional coating with Nafion, serving as a membrane material, allows shifting the measuring range even to strongly alkaline conditions.