TiO2 sol-gel films have been doped with colloidal
gold nanoparticles (NPs) and used as a platform for
optical and conductometric gas sensors for CO and H2
detection.
Optical gas sensors of this type require an
operating temperature above 300 \ub0C. Measurements
performed at 360 \ub0C showed a reversible gas-induced
variation of absorption spectra for both CO and H2.
The variation in absorbance depends on testing
wavelength and film annealing temperature.
Conductometric gas sensors showed excellent
performances toward H2 detection with a dynamic
response close to ideal
