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Effect of Electrode Microstructure on the Sensitivity and Response Time of Potentiometric NOX Sensors

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Nanometric La2CuO4 was synthesized with the Pechini method, co-precipitation, and two variations of the auto-ignition technique for fabricating NOX sensor electrodes. The auto-ignition technique produced the most phase-pure powder with the smallest particle size and the largest specific surface area. The sensor electrodes were subjected to various thermal treatments resulting in a variety of electrode grain sizes and distributions. The response times of the sensors were exponentially dependent on electrode grain size. Sensors with fine-grained electrodes were able to produce a steady-state and consistent voltage at lower temperatures; improving their response sensitivity. Sensors fabricated with powders synthesized through the auto-ignition route responded quickly, sensitively, and reproducibility to NO.

Document Type: Research Article


Affiliations: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611

Publication date: June 1, 2008


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