Application of V2O5/WO3/TiO2 for Resistive-Type SO2 Sensors

Sensors

Noriya Izu¹  Gunter Hagen¹  Daniela Schönauer¹  Ulla Rr-Roith¹ 

[1] Functional Materials Laboratory, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany; E-Mails:

关键词: sulfur dioxide;    selective catalytic reduction (SCR);    gas sensor;    vanadia tungsten titania;   

DOI  :  10.3390/s110302982

来源: mdpi

【 摘 要 】

A study on the application of V₂O₅/WO₃/TiO₂ (VWT) as the sensitive material for resistive-type SO₂ 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 SO₂ concentration in the range from 20 ppm to 5,000 ppm. The best sensor response to SO₂ 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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.