title: Electron field emission of a nitrogen-doped TiO(2) nanotube array.
abstract: A nitrogen-doped titania nanotube array vertically aligned on a titanium substrate exhibits efficient electron field emission. Such a titania nanotube array shows very good stability at high field emission current (fluctuation <3% at field emission current of 160 µA within 4 h) and low turn-on and threshold fields (11.2 and 24.4 V µm(-1), respectively) because of the coexistence of doped nitrogen and concomitant oxygen vacancies in titania nanotubes. This work demonstrates the possibility of converting pure titania nanotubes without field emission into a favorable and efficient one through the introduction of acceptor states and donor states both above the valence band maximum and below the conduction band minimum in the band gap of titania by the doped nitrogen and concomitant oxygen vacancies, respectively. Application of this doping concept to other transition metal oxides can be expected to broaden the scope of field emission materials.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China. ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australia Institute of Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Wang
authors.forename: Dai-Ming
authors.initials: DM
authors.lastname: Tang
authors.forename: Chang
authors.initials: C
authors.lastname: Liu
authors.forename: Xiuliang
authors.initials: X
authors.lastname: Ma
authors.forename: Gao Qing
authors.initials: GQ
authors.lastname: Lu
authors.forename: Hui-Ming
authors.initials: HM
authors.lastname: Cheng