title: Wide-range hydrogen sensing with Nb-doped TiO2 nanotubes.
abstract: Anatase-type titania nanotubes doped with Nb element were fabricated through an anodization of Ti35Nb alloy substrate and further annealing at 450 °C. Hydrogen sensitivity of the Nb-doped TiO(2) nanotubes at room temperature was investigated through exposure of the nanotube samples to different hydrogen atmospheres. At room temperature, the Nb-doped nanotubes demonstrated a good sensitivity for wide-range detection of both dilute and high-concentration hydrogen atmospheres ranging from 50 ppm to 2% H(2). The Nb-doped nanotubes also presented remarkable reversibility and repeatability as well as a quick response to the hydrogen atmosphere. The Nb-doped titania nanotubes have great advantages as robust and wide-range hydrogen sensors operating at room temperature.
authors.affiliation: Institute of Microelectronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
authors.forename: Hegang
authors.initials: H
authors.lastname: Liu
authors.forename: Dongyan
authors.initials: D
authors.lastname: Ding
authors.forename: Congqin
authors.initials: C
authors.lastname: Ning
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Li
mesh_terms: D001272:Atmosphere; D006859:Hydrogen / Q000032:analysis*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D009556:Niobium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D009556:Niobium; C009495:titanium dioxide; D006859:Hydrogen; D014025:Titanium