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Hydrogen sensing with Ni-doped TiO2 nanotubes
Zhaohui Li1, Dongyan Ding, Qiang Liu
1Institute of Microelectronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. lizhaohui@sjtu.edu.cn
Sensors (Basel, Switzerland)
|July 25, 2013
Summary
Nickel-doped titanium dioxide (TiO2) nanotubes show excellent hydrogen sensing capabilities. Ni doping enhances TiO2 properties, enabling sensitive detection of hydrogen gas at various temperatures.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Modifying titanium dioxide (TiO2) nanomaterials with dopants is crucial for tuning their physical and chemical properties.
- Nickel (Ni) doping offers a promising route to enhance TiO2 performance for specific applications.
Purpose of the Study:
- To fabricate Ni-doped TiO2 nanotubes using anodic oxidation of NiTi alloy.
- To investigate the hydrogen sensing properties of the fabricated Ni-doped TiO2 nanotubes.
- To understand the effect of Ni doping on the electronic structure and sensing mechanism of TiO2.
Main Methods:
- Fabrication of Ni-doped TiO2 nanotubes via anodic oxidation of NiTi alloy.
- Annealing treatment of the fabricated nanotubes.
- Hydrogen sensing measurements at room and elevated temperatures.
- First-Principle simulations to analyze electronic structure changes.
Main Results:
- Ni-doped TiO2 nanotubes exhibited sensitivity to 1,000 ppm hydrogen.
- Good sensing response was observed at both room temperature and elevated temperatures.
- First-Principle simulations indicated that Ni doping decreases the bandgap of TiO2.
- Hydrogen adsorption led to an increased bandgap and generation of acceptor impurity levels, altering sensor resistance.
Conclusions:
- Ni doping effectively modifies TiO2 nanotubes, enhancing their hydrogen sensing capabilities.
- The observed sensing mechanism is linked to doping-induced changes in the electronic band structure and hydrogen adsorption effects.
- Ni-doped TiO2 nanotubes are promising materials for hydrogen gas sensing applications.
