Electrical characterization of semiconducting La2CuO4 for potentiometric gas sensor applications

Briggs White*, Martin Van Assche, Enrico Traversa, Eric Wachsman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

Potentiometric sensors of the configuration La2CuO 4|YSZ|Pt are sensitive to ppm-levels of NO, NO2 and CO gas while they are insensitive to %-level variations in oxygen concentration. The voltage response is determined by the Differential Electrode Equilibria. The equilibria attained at each electrode is a function of the catalytic and electrocatalytic activity as well as the often overlooked semiconductor character of the electrode. In fact, many metal oxides used as potentiometric sensor electrodes are semiconductors. The Fermi level of a semiconductor is very sensitive to gas adsorption and changes proportionally as the gas concentration does. The Fermi level can be directly related to the electrode potential. Therefore, adsorption-induced Fermi level changes make a contribution to the potentiometric response when semiconductors are used as electrode materials. We have fabricated, characterized, and compared potentiometric and conductometric sensors with La2CuO4 sensing electrodes to illustrate this effect. copyright The Electrochemical Society.

Original languageEnglish (US)
Title of host publicationSolid State Ionic Devices IV
Pages109-119
Number of pages11
Edition7
DOIs
StatePublished - Dec 1 2005
Event4th International Symposium on Solid-State Ionic Devices - 208th Meeting of the Electrochemical Society - Los Angeles, CA, United States
Duration: Oct 16 2005Oct 21 2005

Publication series

NameECS Transactions
Number7
Volume1
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other4th International Symposium on Solid-State Ionic Devices - 208th Meeting of the Electrochemical Society
CountryUnited States
CityLos Angeles, CA
Period10/16/0510/21/05

ASJC Scopus subject areas

  • Engineering(all)

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