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Janosch Kneer


Janosch Kneer

Department for Microsystems Engineering – IMTEK, University Freiburg
Chair for Gas Sensor Systems
Georges-Köhler-Allee 102
79110 Freiburg

Tel: +49 (0)761 203 97632

Mail: Janosch.Kneer@imtek.uni-freiburg.de

Homepage: https://portal.uni-freiburg.de/gassensoren

Curriculum Vitae

Born in Germany, Villingen-Schwenningen, 1985

Germany, University of Freiburg (Albert-Ludwigs-Universität), Microsystems Engineering – Focus on Materials and Process Technology


Practical and scientific experience

Jun. 2006 – Jul. 2007 Fraunhofer Institute for Solar Energy
Thin film deposition of anti-reflection coatings for solar cells
Oct. 2008 – Mar. 2009 Siemens Corp. Tech. – Materials & Microsystems
Research on flexible electrical contacts for piezoelectric devices and reliability testing
Oct. 2009 – Mar. 2011 Fraunhofer Institute for Physical Measurement Techniques
Development of an inkjet deposition for gas sensitive metal oxide layers and investigation of sensor characteristics


Kneer, J.; Boxberg, M.; Busch, S.; Eberhardt, A.; Palzer, S.; Wöllenstein, J.: Alterations in the complex refractive index of copper oxide thin films as sensing effect for hydrogen sulfide monitoring. Microsystems Technology, 2013. In press

Kneer, J.; Boxberg, M.; Wöllenstein, J.: Optical properties of copper oxide thin films as selective sensing principle for hydrogen sulfide detection, Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI, 87630E; doi: 10.1117/12.2017330 

Peter C.; Kneer, J.; Wöllenstein, J.: Inkjet Printing of Titanium Doped Chromium Oxide for Gas Sensing Application, Sensor Letters, Vol 9, Nr 2, 2011.

Kneer, J.; Peter C.; Wöllenstein, J.: Variable Prozessierung von gassensitivem Chrom-Titan-Oxid mittels neuartigem Inkjet-Abscheideverfahren, In: Tagungsband zur 15. ITG/GMA-Fachtagung, VDE Verlag, Berlin, 2010.

Abstract of thesis

Detection of gaseous contaminants during the generation and treatment of biogas

During the generation of biogas, various contaminant gases occur beside the desired methane. Hydrogen sulfide (H2S) and volatile siloxanes (VMS) are two main contaminants causing severe damage to facility parts and attached cogeneration units. Different filtering techniques are established, but operated in inefficient overdosing mode because current detection systems are measuring discontinuously or having no detection unit for contaminants at all. Scope of the thesis is the development of a sensor concept, which is able to continuously and selectively measure contaminant gases for dynamic control system to improve filtering techniques and prevent frequent maintenance or failure.

For the mentioned gases possible approaches for the detection of H2S, being a reducing gas, are for example the resistive read-out of polymer ion-sensitive layers or copper oxide/tin oxide hetero junctions. Molecules of the VMS family are comparably unreactive. This requires research on specifically adsorbing layers and mass- or surface sensitive detection principles.

Research interests

  • Novel functional materials
  • Semiconducting metal oxides
  • Polymer electrolytes
  • Inkjet deposition
  • Surface chemistry and modification
  • Optical gas detection systems
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