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Amperometric Gas Sensors of High Sensitivity
Author(s) -
Hodgson Alexia W. E.,
Jacquinot Patrick,
Jordan Larry R.,
Hauser Peter C.
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199907)11:10/11<782::aid-elan782>3.0.co;2-s
Subject(s) - amperometry , electrolyte , chemistry , acetaldehyde , membrane , nafion , polymer , ion exchange , relative humidity , sulfur dioxide , electrode , chromatography , chemical engineering , inorganic chemistry , ethanol , ion , electrochemistry , organic chemistry , biochemistry , physics , engineering , thermodynamics
Amperometric gas sensors for the detection of ethylene, ethanol, acetaldehyde, and sulfur dioxide down to very low ppb concentrations are described. The design is based on porous Au electrodes supported on solid polymer electrolytes (SPE). Nafion as cation exchange membrane and a chemically grafted perfluorinated anion exchange membrane were employed as SPE. The sensors may be tailored to the highly sensitive detection of a specific gas by carefully selecting the component materials and the experimental conditions. The influence of gas flow rate, relative humidity of the gas streams and real surface area of the SPE electrodes are discussed.