title: Application of V2O5/WO3/TiO2 for resistive-type SO2 sensors.
abstract: A study on the application of V(2)O(5)/WO(3)/TiO(2) (VWT) as the sensitive material for resistive-type SO(2) sensor was conducted, based on the fact that VWT is a well-known catalyst material for good selective catalytic nitrogen oxide reduction with a proven excellent durability in exhaust gases. The sensors fabricated in this study are planar ones with interdigitated electrodes of Au or Pt. The vanadium content of the utilized VWT is 1.5 or 3.0 wt%. The resistance of VWT decreases with an increasing SO(2) concentration in the range from 20 ppm to 5,000 ppm. The best sensor response to SO(2) occurs at 400 °C using Au electrodes. The sensor response value is independent on the amount of added vanadium but dependent on the electrode materials at 400 °C. These results are discussed and a sensing mechanism is discussed.
authors.affiliation: Functional Materials Laboratory, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany. noriya.izu@uni-bayreuth.de
authors.forename: Noriya
authors.initials: N
authors.lastname: Izu
authors.forename: Gunter
authors.initials: G
authors.lastname: Hagen
authors.forename: Daniela
authors.initials: D
authors.lastname: Schönauer
authors.forename: Ulla
authors.initials: U
authors.lastname: Röder-Roith
authors.forename: Ralf
authors.initials: R
authors.lastname: Moos
mesh_terms: D017097:Electric Impedance; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D013458:Sulfur Dioxide / Q000032:analysis*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D010087:Oxides; D017968:Vanadium Compounds; D013458:Sulfur Dioxide; C009495:titanium dioxide; C511604:tungsten oxide; C066075:vanadium pentoxide; D014025:Titanium; D010100:Oxygen; D014414:Tungsten