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

Emily C. Hernández, Charles Mortensen, Leonidas G Bachas

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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
JournalElectroanalysis
Volume9
Issue number14
StatePublished - Oct 1997
Externally publishedYes

Fingerprint

Polypyrroles
Chemical sensors
Nitrates
Electrodes
Gas permeable membranes
Pyrroles
Sensors
Nitrites
polypyrrole
Salts
Gases

Keywords

  • Nitrate
  • NO
  • Polypyrrole
  • Sensor

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Development of NOx Gas Sensors Based on Nitrate-Selective Polypyrrole Electrodes. / Hernández, Emily C.; Mortensen, Charles; Bachas, Leonidas G.

In: Electroanalysis, Vol. 9, No. 14, 10.1997, p. 1049-1053.

Research output: Contribution to journalArticle

Hernández, Emily C. ; Mortensen, Charles ; Bachas, Leonidas G. / Development of NOx Gas Sensors Based on Nitrate-Selective Polypyrrole Electrodes. In: Electroanalysis. 1997 ; Vol. 9, No. 14. pp. 1049-1053.
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