Photoconductive TiO2 Dielectrics Prepared by Plasma Spraying
Source abstract
Abstract
Titanium dioxide coatings (TiO2) were sprayed using a water-stabilized plasma gun (WSP) to form robust self-supporting bodies with the character of a ceramic disc capacitor (CDC). Agglomerated nanometric powder was used as feedstock. Argon was applied for powder feeding as well as coating–cooling to minimize the influence of ambient air. Stainless steel was used as a substrate, and the coatings were released after cooling. A more than three-millimeter-thick self-supporting TiO2 plate was observed using HR-TEM and SEM. Porosity was studied by image analysis on polished sections. Thermal post-treatment on the coating was conducted at a rather low temperature of 500 °C. The results of the subsequent dielectric measurement showed high permittivity, but this was strongly frequency-dependent and accompanied by a progressively decreasing loss tangent. On the other hand, the plasma-sprayed TiO2 exhibited persistent DC photoconductivity under and after illumination with a standard bulb.
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Research context
OpenAlex topics: Dielectric properties of ceramics · Semiconductor materials and devices · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
The Czech Academy of Sciences, Institute of Plasma Physics, Za Slovankou 3, 182 00 Prague, Czech Republic
Faculty of Electrical Engineering, Czech Technical University, Technická 2, 166 27 Prague, Czech Republic
References (30)
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