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Gas sensors

Gas sensing is one of the main interests in our research.

The research topics deal with materials and mechanism, applications and concepts or novel sensing principles. Furthermore, we work on all aspects of the process chain for sensor manufacturing and sensors characterization.

A special focus is given to chemical sensors comprising ceramic functional materials. Here, we are dealing with thick- or thin-film technology and ceramic multilayer technology (HTCC and LTCC).

Beside comprehensive sensor characterization in synthetic or real exhaust with versatile electrical or electrochemical methods, we are modelling and simulating material parameters as well as entire sensor elements.

In the field of gas sensing, we have available the complete process chain from material synthesis up to characterization. “Sensor Prototyping” is our business.

This contains:

  • Material synthesis (powder synthesis by mixed-oxide or wet-chemical routes, powder processing to screen-printable pastes)
  • Transducer technology (ceramic multilayers in LTCC or HTCC, isostatic pressing, laser patterning)
  • Thick- and thin-film technology (screen-printing, aerosol deposition, photolithography, thermal and e-beam evaporation)
  • Sensor characterization in conditions close to reality (several test benches for defined dosing of all (exhaust) components like N2, O2, CO2, H2O, CO, NO, NO2, hydrocarbons, H2, NH3, formaldehyde, SO2 and others in heated chambers or for self-heated sensors, downstream analytics (CLD, FID, NDIR, GC, FTIR usw.))
  • Materialcharakterisierung: Rasterelektronenmikroskop (REM) mit Elementanalyse (EDX) und variablem Druck (ESEM)

The gas sensitive functional layers are investigated with regard to sensitivity and cross-sensitivities, response times or poisoning. We use classical amperometric, resistive or potentiometric methods as well as impedance spectroscopy up to 1600 °C in defined atmospheres.
The main need for a sensor development (targeted to highly selective and –sensitive devices e.g. for on-board-diagnostic purposes in automotive applications) is a deep understanding of the basic mechanism. Therefore, material characterization data are evaluated and can be used for theoretical models of the sensing behavior.

Contact:
Prof. Dr.-Ing. Ralf Moos, Phone: +49 (0)921 55 7400, Ralf.Moos@uni-bayreuth.de
Dr.-Ing. Gunter Hagen, Phone:: +49 (0)921 55 7406, Gunter.Hagen@uni-bayreuth.de
Dr.-Ing. Daniela Schönauer-Kamin, Telefon: +49 (0)921 55 7458, Daniela.Schoenauer-Kamin@uni-bayreuth.de

   
Department of Functional Materials | Faculty of Engineering Science | University of Bayreuth
Universitätsstraße 30 | D - 95447 Bayreuth | Germany
Phone: +49 (0)921 55 7401 | Facsimile: +49 (0)921 55 7405 | funktionsmaterialien@uni-bayreuth.de