Mesostructured pure and copper-catalyzed tungsten oxide for NO2 detection

Emma Rossinyol, Anna Prim, Eva Pellicer, Jordi Rodríguez, Francesca Peiró, Albert Cornet, Joan Ramon Morante, Bozhi Tian, Tu Bo, Dongyuan Zhao

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Abstract

Different tungsten oxide mesoporous nanostructures were used as resistive solid state sensor for NO2 gas detection. The electrical characterization revealed that WO3 was sensitive to NO2, even to low gas concentrations, although differences attributable to its structure were observed. The mesoporous material synthesized as a replica of three-dimensional cubic (KIT-6) silica structure showed better and faster response than two-dimensional hexagonal (SBA-15) structure. The introduction of copper as catalytic additive allowed improving both sensor response and response time. X-ray photoelectron spectroscopy (XPS) measurements showed that copper was mainly placed at the material surface as Cu(I).

Original languageEnglish
Pages (from-to)18-23
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume126
Issue number1
DOIs
Publication statusPublished - 20 Sep 2007
Externally publishedYes

Keywords

  • Catalytic additive
  • Gas sensor
  • Mesoporous oxide
  • WO

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