title: Enhanced field emission from hydrogenated TiO2 nanotube arrays.
abstract: The field emission (FE) properties of TiO(2) nanotube arrays (TNAs) synthesized by anodization are dramatically improved after hydrogenation at various temperatures in a range of 400-550 °C. Compared with pristine TNAs, the turn-on fields of hydrogenated TNAs (H:TNAs) are significantly decreased from 18.23 to 1.75 V μm(-1), and closely related to hydrogenation temperature. Importantly, the optimized sample of H:TNAs prepared at 550 °C shows excellent FE performances involving both a low turn-on field of 1.75 V μm(-1), a high current density of 4.0 mA cm(-2) at 4.50V μm(-1), and a remarkable FE stability over 480 min. The substantially enhanced FE properties can be attributed to the combination of a typical tubular morphology, a reduced work function and the improved conductivity of H:TNAs.
authors.affiliation: Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, People's Republic of China.
authors.forename: Wei-Dong
authors.initials: WD
authors.lastname: Zhu
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Wang
authors.forename: Jian-Biao
authors.initials: JB
authors.lastname: Chen
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Hao-Li
authors.initials: HL
authors.lastname: Zhang