Electrodeposition of Zinc Oxide (ZnO) for Carbon Monoxide (CO) sensing
Abstract
ZnO films were successfully fabricated through electrophoretic deposition. Six (6) samples were prepared with different applied voltages. Higher applied voltages resulted to higher mass of ZnO deposits and higher sensitivities at 26.5 oC. The fabricated samples were reversible and more sensitive at greater CO concentrations. Obtaining more mass of deposits and the exposure to higher CO concentration can lead to a better sensitivity because more ZnO particles and CO molecules can perform and contribute to gas sensing. SEM revealed that the most and least sensitive samples’ (6 and 1 respectively) deposits were porous. Sample 6 had higher gas response than sample 1 due to its smaller particle size and thicker layer of deposits. Porosity and the size reduction of ZnO particles can enhance its sensing properties due to an increase of surface to volume ratio which allows more particles to perform in bulk gas interaction.
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