Investigation of the reaction mechanisms in work function type sensors at room temperature by studies of the cross-sensitivity to oxygen and water: the carbonate-carbon dioxide system

Bernhard Ostrick, Maximilian Fleischer, H. Meixner, Claus Dieter Kohl

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Thin films and screen-printed films of BaCO3 react to changes of CO2 in wet synthetic air at room temperature with a change of the work function as measured by the Kelvin method. The reaction is due to the formation of hydrogen carbonate ions on the surface. In this work, the reaction mechanism is investigated by studying the cross-sensitivities to oxygen and humidity in the temperature range between 25°C and 250°C. At low temperatures between 25°C and 100°C, the reaction involves water whereas at temperatures above 200°C, the reaction is driven by the presence of oxygen. In both cases, the reaction can be described in terms of a Nernst equation. In the low-temperature region, however, the (thickness-independent) potential type of reaction is superimposed by a (thickness-dependent) capacitance type of reaction to humidity like in the well-known capacitive humidity sensors.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume68
Issue number1
DOIs
Publication statusPublished - Aug 25 2000

Fingerprint

Carbonates
Carbon Dioxide
carbon dioxide
carbonates
Carbon dioxide
Oxygen
Water
sensors
Sensors
room temperature
oxygen
water
humidity
Atmospheric humidity
Temperature
Capacitive sensors
Humidity sensors
Bicarbonates
Capacitance
Ions

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Investigation of the reaction mechanisms in work function type sensors at room temperature by studies of the cross-sensitivity to oxygen and water : the carbonate-carbon dioxide system. / Ostrick, Bernhard; Fleischer, Maximilian; Meixner, H.; Kohl, Claus Dieter.

In: Sensors and Actuators, B: Chemical, Vol. 68, No. 1, 25.08.2000, p. 197-202.

Research output: Contribution to journalArticle

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