The TiO2 opals were functionalized with palladium nanoparticles and were used in the fabrication of chemical sensors for the detection of hydrogen (H2) using hydrogen concentrations in the order of parts per million (ppm) at moderate temperatures (300-450°C). The results showed that the inclusion of palladium nanoparticles on the surface of TiO2 inverse opals improves the sensing performance. Particularly the sensor response increased two-fold and the time constants were reduced to several seconds, in comparison with the sensor without palladium nanoparticles at the optimal sensor operating temperature. These results show that the TiO2 inverse opals are an excellent option in the development of third-generation gas sensors.

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