Titanium dioxide based high temperature carbon monoxide selective sensor

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Gas Sensors Based on One Dimensional Nanostructured Metal-Oxides: A Review (2012, background): “Comparing the sensitivity of anatase and rutile nanostructures it is seen that anatase polymorph of TiO2 has high sensitivity towards reducing gases like H2 and CO [81–83].”
Cr-doped TiO2 gas sensor for exhaust NO2 monitoring (2003, methodology): “Pt has been used as a catalyst to quicken oxygen response in lambda devices [7,8]; Cu improves selectivity to CO [9,10]; alcohol sensors can be made with the addition of Nb [11].”
High‐Temperature Ceramic Gas Sensors: A Review (2006, methodology): “To the La-stabilized anantase, we then add CuO (labeled ALC) for improving sensitivity.(19) Figure 3 shows the results of changes in the electrical resistance of an ALC sample upon exposure to CH4 and CO at 6001C.”
Hydrogen sensing using titania nanotubes (2003, background): “Anatase, the polymorph of titania has been reported to be of high sensitivity towards reducing gases like hydrogen and carbon monoxide [13, 16 ,25].”