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Hydrogen Sensing with Ni-Doped TiO2 Nanotubes
Institute of Microelectronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
* Author to whom correspondence should be addressed.
Received: 2 May 2013; in revised form: 19 June 2013 / Accepted: 24 June 2013 / Published: 1 July 2013
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
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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.
Li Z, Ding D, Liu Q, Ning C. Hydrogen Sensing with Ni-Doped TiO2 Nanotubes. Sensors. 2013; 13(7):8393-8402.
Li, Zhaohui; Ding, Dongyan; Liu, Qiang; Ning, Congqin. 2013. "Hydrogen Sensing with Ni-Doped TiO2 Nanotubes." Sensors 13, no. 7: 8393-8402.