title: A high temperature capacitive humidity sensor based on mesoporous silica.
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.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany. thorsten.wagner@upb.de
authors.forename: Thorsten
authors.initials: T
authors.lastname: Wagner
authors.forename: Sören
authors.initials: S
authors.lastname: Krotzky
authors.forename: Alexander
authors.initials: A
authors.lastname: Weiss
authors.forename: Tilman
authors.initials: T
authors.lastname: Sauerwald
authors.forename: Claus-Dieter
authors.initials: CD
authors.lastname: Kohl
authors.forename: Jan
authors.initials: J
authors.lastname: Roggenbuck
authors.forename: Michael
authors.initials: M
authors.lastname: Tiemann
mesh_terms: D025802:Electric Capacitance; D004581:Electronics / Q000295:instrumentation*; D006046:Gold / Q000737:chemistry; D006813:Humidity; D046529:Microscopy, Electron, Transmission; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D006046:Gold; D012822:Silicon Dioxide; D009584:Nitrogen