Fast highly-sensitive room-temperature semiconductor gas sensor based on the nanoscale Pt-TiO2-Pt sandwich

- Hydrogen gas sensor based on the nanoscale Pt-TiO2-Pt sandwich is presented.
- The sensor exhibits high sensitivity and fast reaction time at room temperature.
- The high sensitivity is due to the high applied field and small top electrode width.
- The hot-electron-transport theory of the sensor response is developed.