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1

Department of Chemistry, Faculty of Science, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

2

Max-Planck-Institute for Solid State Research, Nanoscale Science Department, Heisenbergstr. 1, D-70569 Stuttgart, Germany

3

Institute for Applied Physics, Justus Liebig University, Heinrich-Buff-Ring 16, D-35390 Giessen, Germany

4

Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 16, D-35390 Giessen, Germany





*

Author to whom correspondence should be addressed.



Abstract Capacitive sensors are the most commonly used devices for the detection of humidity because they are inexpensive and the detection mechanism is very specific for humidity. However, especially for industrial processes, there is a lack of dielectrics that are stable at high temperature 200 °C and under harsh conditions. We present a capacitive sensor based on mesoporous silica as the dielectric in a simple sensor design based on pressed silica pellets. Investigation of the structural stability of the porous silica under simulated operating conditions as well as the influence of the pellet production will be shown. Impedance measurements demonstrate the utility of the sensor at both low 90 °C and high up to 210 °C operating temperatures. View Full-Text

Keywords: capacitive sensor; humidity; high temperature; mesoporous silica capacitive sensor; humidity; high temperature; mesoporous silica





Autor: Thorsten Wagner 1,* , Sören Krotzky 2, Alexander Weiß 3, Tilman Sauerwald 3, Claus-Dieter Kohl 3, Jan Roggenbuck 4 and Michael Tiemann 1

Fuente: http://mdpi.com/



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