|
|||||
|
|
Effects of CF4 plasma on the field emission properties of aligned multi-wall carbon nanotube films |
|
| Authors: | YW Zhu FC Cheong XJ Xu CT Lim JTL Thong ZX Shen CK Ong ATS Wee CH Sow |
| Affiliation: | a Department of Physics, National University of Singapore, Blk S12, 2 Science Drive 3, Singapore 117542, Singapore b National University of Singapore Nanoscience and Nanotechnology Initiative, Singapore 117576, Singapore c Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore d Center for Integrated Circuit Failure Analysis and Reliability, Faculty of Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore |
| Abstract: | We present a simple method to functionalize the surface and to modify the structures of aligned multi-wall carbon nanotube (CNT) arrays grown on silicon substrates using CF4 plasma produced by reactive ion etching (RIE). Field emission (FE) measurements showed that after 2 min of plasma treatment, the emission currents were enhanced compared with as-grown CNTs; however, extended treatment over 2 min was found to degrade the FE properties of the film. Scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy have been employed to investigate the mechanism behind the modified FE properties of the CNT film. The FE enhancement after 2 min of etching could be attributed to favorable surface morphologies, open-ended structures and a large number of defects in the aligned CNT films. On the other hand, deposition of an amorphous layer comprising carbon and fluorine during extended CF4 plasma treatment may hamper the field emission of CNT films. |
| Keywords: | A Carbon nanotubes B Etching D Field emission |
| 本文献已被 ScienceDirect 等数据库收录！ | |