Development of NOx Gas Sensors Based on Nitrate-Selective Polypyrrole Electrodes

Emily C. Hernández, Charles Mortensen, Leonidas G. Bachas

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A nitrate-selective polypyrrole-based electrode was used in the development of NOx sensors. The nitrate-selective film was prepared by electropolymerizing pyrrole in presence of a nitrate salt. This resulted in a film that responded to nitrate in buffered media with near-Nernstian slopes and excellent reproducibility. This electrode was incorporated into a gas-sensing arrangement where it was immersed in a buffered compartment and separated from an acidified sample solution by a gas-permeable membrane. Additions of nitrite to the acidified solution resulted in the production of NOx, which can cross the gas-permeable membrane into the buffered internal filling solution where it is trapped as nitrate and sensed by the nitrate-selective polypyrrole electrode. This sensor arrangement resulted in detection limits in the μM range and had excellent selectivity characteristics.

Original languageEnglish (US)
Pages (from-to)1049-1053
Number of pages5
Issue number14
StatePublished - Oct 1997
Externally publishedYes


  • NO
  • Nitrate
  • Polypyrrole
  • Sensor

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry


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