Abstract
Hybrid titania films have been prepared using an adapted sol–gel method for obtainingwell-dispersed hydrogen plasma-treated multiwall carbon nanotubes in either puretitania or Nb-doped titania. The drop-coating method has been used to fabricateresistive oxygen sensors based on titania or on titania and carbon nanotube hybrids.Morphology and composition studies have revealed that the dispersion of low amounts ofcarbon nanotubes within the titania matrix does not significantly alter its crystallizationbehaviour. The gas sensitivity studies performed on the different samples have shown that thehybrid layers based on titania and carbon nanotubes possess an unprecedented responsivenesstowards oxygen (i.e. more than four times higher than that shown by optimized Nb-dopedTiO2 films). Furthermore, hybrid sensors containing carbon nanotubes respond atsignificantly lower operating temperatures than their non-hybrid counterparts.These new hybrid sensors show a strong potential for monitoring traces of oxygen(i.e. ≤10 ppm)in a flow of CO2, which is of interest for the beverage industry.
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