TiO2 nanotube films were formed on pure Ti, Ti-Pt, and Ti-Pd thin films by anodization in a mixture of glycerol and water (1:1 volume ratio) containing 0.5 wt % NH4 F and were applied as a resistance-type hydrogen gas sensor. A transmission electron microscopy analysis of the TiO 2 nanotube films revealed that the nanosized particles of Pt and Pd were dispersed in the wall of the nanotube. These dispersed Pt or Pd particles effectively improved the performance of the hydrogen gas sensor perhaps due to the acceleration of hydrogen chemisorption on the wall of the nanotube. Pt- and Pd-added TiO2 nanotube sensors showed a two-order decrease in resistance upon exposure to 1000 ppm H2 at 290°C and had little or no response to 1000 ppm CH4, 1000 ppm CO, and 1 ppm SO 2.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry