A titania nanotube-array room-temperature sensor for selective detection of hydrogen at low concentrations.

@article{Varghese2004ATN,
  title={A titania nanotube-array room-temperature sensor for selective detection of hydrogen at low concentrations.},
  author={Oomman K. Varghese and Gopal K Mor and Craig A. Grimes and Maggie Paulose and Niloy Mukherjee},
  journal={Journal of nanoscience and nanotechnology},
  year={2004},
  volume={4 7},
  pages={733-7}
}
A tremendous variation in electrical resistance, from the semiconductor to metallic range, has been observed in titania nanotube arrays at room temperature, approximately 25 degrees C, in the presence of < or = 1000 ppm hydrogen gas. The nanotube arrays are fabricated by anodizing titanium foil in an aqueous electrolyte solution containing hydrofluoric acid and acetic acid. Subsequently, the arrays are coated with a 10 nm layer of palladium by evaporation. Electrical contacts are made by… CONTINUE READING