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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
Hydrogen sensing in titanate nanotubes associated with modulation in protonic conduction
D C B Alves1, A M B Goncalves, L C Campos
1Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Nanotechnology
|April 9, 2011
Summary
Hydrogen/sodium titanate nanotubes (TNTs) show excellent hydrogen sensing capabilities, particularly at room temperature. Their sensing mechanism shifts from protonic to electronic transport with increasing temperature, impacting overall sensitivity.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Hydrogen/sodium titanate nanotubes (TNTs) are explored for gas sensing applications.
- Understanding transport mechanisms in nanomaterials is crucial for sensor development.
Purpose of the Study:
- To investigate the hydrogen (H(2)) sensing properties of TNT films.
- To correlate sensing performance with underlying electrical transport mechanisms.
Main Methods:
- Electrical conductivity measurements of TNT films across a temperature range (25-300°C).
- Analysis of gas sensing response under varying atmospheres.
- Investigation of temperature dependence of H(2) sensitivity.
Main Results:
- TNT films demonstrate significant H(2) sensing response, especially at room temperature.
- Conduction is protonic below 100°C and electronic above 100°C.
- H(2) sensitivity is linked to the dominant transport mechanism, with protonic conduction modulation at low temperatures.
Conclusions:
- TNTs are effective room-temperature hydrogen sensors.
- The dual transport mechanism (protonic and electronic) influences H(2) sensing behavior.
- Surface hydroxyl group dynamics play a key role in low-temperature protonic conduction sensing.
