Sensors 2013, 13(7), 8393-8402; doi:10.3390/s130708393
Article

Hydrogen Sensing with Ni-Doped TiO2 Nanotubes

1email, 1,* email, 1email and 2email
Received: 2 May 2013; in revised form: 19 June 2013 / Accepted: 24 June 2013 / Published: 1 July 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
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Abstract: Doping with other elements is one of the efficient ways to modify the physical and chemical properties of TiO2 nanomaterials. In the present work, Ni-doped TiO2 nanotubes were fabricated through anodic oxidation of NiTi alloy and further annealing treatment. The hydrogen sensing properties of the nanotube sensor were investigated. It was found that the Ni-doped TiO2 nanotubes were sensitive to an atmosphere of 1,000 ppm hydrogen, showing a good response at both room temperature and elevated temperatures. A First-Principle simulation revealed that, in comparison with pure anatase TiO2 oxide, Ni doping in the TiO2 oxide could result in a decreased bandgap. When the oxide sensor adsorbed a certain amount of hydrogen the bandgap increased and the acceptor impurity levels was generated, which resulted in a change of the sensor resistance.
Keywords: TiO2; nanotubes; doping; hydrogen sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Li, Z.; Ding, D.; Liu, Q.; Ning, C. Hydrogen Sensing with Ni-Doped TiO2 Nanotubes. Sensors 2013, 13, 8393-8402.

AMA Style

Li Z, Ding D, Liu Q, Ning C. Hydrogen Sensing with Ni-Doped TiO2 Nanotubes. Sensors. 2013; 13(7):8393-8402.

Chicago/Turabian Style

Li, Zhaohui; Ding, Dongyan; Liu, Qiang; Ning, Congqin. 2013. "Hydrogen Sensing with Ni-Doped TiO2 Nanotubes." Sensors 13, no. 7: 8393-8402.


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