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Effect of Electrode Microstructure on the Sensitivity and Response Time of Potentiometric NO X Sensors
Author(s) -
White Briggs,
Chatterjee Suman,
Macam Eric,
Wachsman Eric
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02384.x
Subject(s) - electrode , materials science , grain size , microstructure , ignition system , particle size , response time , analytical chemistry (journal) , sensitivity (control systems) , potentiometric titration , precipitation , composite material , chemical engineering , electronic engineering , chemistry , chromatography , engineering , physics , computer graphics (images) , meteorology , computer science , thermodynamics
Nanometric La 2 CuO 4 was synthesized with the Pechini method, co‐precipitation, and two variations of the auto‐ignition technique for fabricating NO X 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.