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Electrophoretically deposited zinc oxide thick film gas sensor

Electrophoretically deposited zinc oxide thick film gas sensor

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Fabrication of a ZnO gas sensor by electrophoretic deposition (EPD) is reported. EPD of submicron sized ZnO powder on an aluminium-chromium-iron alloy substrate was carried out in pure acetone. The porous thick film obtained was sintered at 1000°C in air. Native aluminium oxide layer grown on the alloy substrate insulated the sintered ZnO layer from the metal substrate. Operated at 250°C, the device showed a 20% conductance change in the presence of 10 ppm wood smoke.

Inspec keywords: porous materials; wide band gap semiconductors; powder technology; II-VI semiconductors; sintering; zinc compounds; gas sensors; electrical conductivity; electrophoretic coating techniques

Other keywords: sintering; acetone; ZnO gas sensor; fabrication; AlCrFe; wood smoke; conductance change; submicron sized ZnO powder; ZnO; electrophoretic deposition; native aluminium oxide layer; 1000 C; aluminium-chromium-iron alloy substrate; sintered ZnO layer; electrophoretically deposited zinc oxide thick film gas sensor; porous thick film; alloy substrate; 250 C

Subjects: Electrical conductivity of II-VI and III-V semiconductors; Electrochemistry and electrophoresis; Low-field transport and mobility; piezoresistance (semiconductors/insulators); Chemical sensors; Electrical properties of II-VI and III-V semiconductors (thin films/low-dimensional structures); II-VI and III-V semiconductors; Chemical sensors; Powder techniques, compaction and sintering; Oxide and ferrite semiconductors; Chemical variables measurement; Deposition from liquid phases (melts and solutions); Deposition from liquid phases; Preparation of ceramics and refractories; Powders and porous materials (engineering materials science)

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