|
|||||
|
|
Field emission from the structure of well-aligned TiO2/Ti nanotube arrays |
|
| Authors: | Jian-Biao Chen Bao-Hong Ma Jian Wang Wei-Min Liu |
| Affiliation: | a College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, PR China b State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, PR China c Joint Laboratory of Atomic and Molecular Physics, NWNU & IMP CAS, Lanzhou, 730070, PR China |
| Abstract: | Well-aligned TiO2/Ti nanotube arrays were synthesized by anodic oxidation of titanium foil in 0.5 wt.% HF in various anodization voltages. The images of filed emission scanning electron microscopy indicate that the nanotubes structure parameters, such as diameter, wall thickness and density, can be controlled by adjusting the anodization voltage. The peaks at 25.3° and 48.0° of X-ray diffraction pattern illuminate that the TiO2 nanotube arrays annealed at 500 °C are mainly in anatase phase. The filed emission (FE) properties of the samples were investigated. A turn-on electric field 7.8 V/µm, a field enhancement factors approximately 870 and a highest FE current density 3.4 mA/cm2 were obtained. The emission current (2.3 mA/cm2 at 18.8 V/µm) was quite stable within 480 min. The results show that the FE properties of TiO2/Ti have much relation to the structure parameters. |
| Keywords: | TiO2/Ti nanotube arrays Field emission X-ray diffraction Scanning electron microscopy Anodic oxidation Annealing |
| 本文献已被 ScienceDirect 等数据库收录！ | |