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

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Abstract:

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

DOI: http://dx.doi.org/10.1111/j.1551-2916.2008.02384.x

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

Publication date: June 1, 2008

bsc/jace/2008/00000091/00000006/art00042
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