Articles | Volume 5, issue 2
J. Sens. Sens. Syst., 5, 273–281, 2016
https://doi.org/10.5194/jsss-5-273-2016

Special issue: Dresden Sensor Symposium 2015

J. Sens. Sens. Syst., 5, 273–281, 2016
https://doi.org/10.5194/jsss-5-273-2016

Regular research article 13 Jul 2016

Regular research article | 13 Jul 2016

Gas sensors based on plasma-electrochemically oxidized titanium foils

Mhamed El Achhab and Klaus Schierbaum Mhamed El Achhab and Klaus Schierbaum
  • Department of Materials Science, Institute of Experimental Condensed Matter Physics, Heinrich Heine University, Düsseldorf, Germany

Abstract. We have developed a preparation technique to form graphite/TiO2/Ti and platinum–graphite/TiO2/Ti solid-state sensors. It is based on plasma electrolytic oxidation (PEO) of titanium foils, whereby a porous titanium oxide layer is formed with well-defined phase composition and a reproducible microstructure. A printing method is used to deposit graphite or catalytically active graphite–platinum electrodes. Our design enables the application of a variety of different detection principles such as calorimetry, impedances and amperometry. This study reports results for H2, H2O, and CO sensing at room temperature with the most appropriate detection principle, electrode composition and titanium oxide microstructure.

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Short summary
We have developed a preparation technique to form graphite/TiO2/Ti and platinum-graphite/TiO2/Ti solid-state sensors based on plasma electrolytic oxidation (PEO) of titanium foils, whereby a porous titanium oxide layer is formed with well-defined phase composition and a reproducible microstructure. A printing method is used to deposit graphite or catalytically active graphite-platinum electrodes. Our design enables the application of many different detection principles such as calorimetry.