Hydrogen Sensing with Ni-Doped TiO2 Nanotubes

Sensors

Zhaohui Li¹  Dongyan Ding¹  Qiang Liu¹ 

[1] Institute of Microelectronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; E-Mails:

关键词: TiO₂;    nanotubes;    doping;    hydrogen sensor;   

DOI  :  10.3390/s130708393

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.