Infrared emission spectroscopic study of the adsorption of oxygen on gas sensors based on polycrystalline metal oxide films

R. Pohle, M. Fleischer, H. Meixner

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Infrared emission spectroscopy (IRES) was used for studying in situ gas-surface interactions and adsorbed species on semiconducting metal oxides based gas sensors under working conditions. Regarding the key position of oxygen for the surface chemistry of oxides, the adsorption and reaction of oxygen was studied on screen printed films of polycrystalline WO3, AlVO4 and Co3O4 in the temperature range between 300 and 600°C. The role of the ionization of oxygen vacancies on the conductivity mechanisms and on the reaction to hydrocarbons will be discussed correlating the results of IRES and conductivity measurements. This work shows that IRES offers a direct access to the generation of free charge carriers due to changes in oxygen partial pressure and reactions with reducing gases.

Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume78
Issue number1-3
DOIs
Publication statusPublished - Aug 30 2001

Fingerprint

Emission spectroscopy
Chemical sensors
Oxide films
metal oxides
oxide films
Infrared spectroscopy
Metals
Oxygen
Infrared radiation
Adsorption
Oxides
adsorption
sensors
oxygen
Gases
gases
Oxygen vacancies
spectroscopy
Hydrocarbons
Surface chemistry

Keywords

  • Adsorption
  • Infrared emission spectroscopy
  • Metal oxides
  • Oxygen

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Infrared emission spectroscopic study of the adsorption of oxygen on gas sensors based on polycrystalline metal oxide films. / Pohle, R.; Fleischer, M.; Meixner, H.

In: Sensors and Actuators, B: Chemical, Vol. 78, No. 1-3, 30.08.2001, p. 133-137.

Research output: Contribution to journalArticle

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