Detection of CO2 and O2 by iron loaded LTL zeolite films

  • Veselina Georgieva
  • Richard Retoux
  • Valerie Ruaux
  • Valentin Valtchev
  • Svetlana Mintova
Research Article


Detection of oxygen and carbon dioxide is important in the field of chemical and biosensors for atmosphere and biosystem monitoring and fermentation processes. The present study reports on the preparation of zeolite films doped with iron nanoparticles for detection of CO2 and O2 in gas phase. Pure nanosized LTL type zeolite with monomodal particle size distribution loaded with iron (Fe-LTL) was prepared under hydrothermal condition from colloidal precursor suspensions. The zeolite was loaded with iron to different levels by ion exchange. The Fe-LTL suspensions were used for preparation of thin films on silicon wafers via spin coating method. The reduction of the iron in the zeolite films was carried out under H2 flow (50% H2 in Ar) at 300 °C. The presence of iron nanoparticles is proved by in situ ultra-violet-visible spectroscopy. The properties of the films including surface roughness, thickness, porosity, and mechanical stability were studied. In addition, the loading and distribution of iron in the zeolite films were investigated. The Fe-LTL zeolite films were used to detect O2 and CO2 in a concentration dependent mode, followed by IR spectroscopy. The changes in the IR bands at 855 and 642 cm–1 (Fe‒O‒H and Fe‒O bending vibrations) and at 2363 and 2333 cm–1 (CO2 asymmetric stretching) corresponding to the presence of O2 and CO2, respectively, were evaluated. The response to O2 and CO2 was instant, which was attributed to great accessibility of the iron in the nanosized zeolite crystals. The saturation of the Fe-LTL films with CO2 and O2 at each concentration was reached within less than a minute. The Fe-LTL films detected both oxygen and carbon dioxide in contrast, to the pure LTL zeolite film.


zeolite films detection of CO2 and O2 adsorption 


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The financial support provided by TARGED ANR and Normandy C2–MTM Project is acknowledged.


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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Veselina Georgieva
    • 1
  • Richard Retoux
    • 2
  • Valerie Ruaux
    • 1
  • Valentin Valtchev
    • 1
  • Svetlana Mintova
    • 1
  1. 1.Laboratoire Catalyse et Spectrochimie (LCS), ENSICAEN, CNRSNormandy UniversityCaenFrance
  2. 2.Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), ENSICAEN, CNRSNormandy UniversityCaenFrance

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