Chapter 26. Design of Screen–Printed Porous Layers for Improving Gas Sensor Performances

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. Jean-Marc Tulliani1,
  2. Elena Billi1,
  3. Laura Montanaro1 and
  4. Gilbert Fantozzi2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch26

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

How to Cite

Tulliani, J.-M., Billi, E., Montanaro, L. and Fantozzi, G. (2002) Design of Screen–Printed Porous Layers for Improving Gas Sensor Performances, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294758.ch26

Author Information

  1. 1

    Dept. Materials Science and Chemical Engineering, Politecnico of Torino, Italy

  2. 2

    GEMPPM, INSA de Lyon Villeurbanne, France

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375792

Online ISBN: 9780470294758

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Keywords:

  • electrochemical;
  • porous materials;
  • metallic catalysts;
  • aluminium oxide;
  • binders

Summary

A porous protective layer has been developed by screen-printing for preserving an electrochemical planar gas sensor from contamination and degradation occurring in hostile conditions, such as car exhaust emissions or gaseous flow from a combustion process. In order to minimise the interface interactions between the overlapped layers, respectively the sensing material based on a solid ionic conductor (β–Al2O3) and the protective layer made of a–Al2O3, a new formulation of the paste for thick film deposition has been adopted. This allows to prepare high-purity layers, without adding any inorganic permanent binder. In this procedure, a gelly precursor of the film material is used, in which a suitable amount of ceramic powder having a proper particle size distribution was dispersed. The total porosity of the film and the mean pore size can be easily tailored by using an α–alumina powder having a proper particle size distribution. Tests performed on laboratory bench and in real working conditions proved that such layer can significantly improve the sensor durability and signal stability.