Field emission properties of carbon nanotubes (CNTs) deposited by electrophoresis were investigated. Uniform deposition of CNTs on 1×1cm2 of Ti substrate was observed by scanning electron microscopy (SEM). In addition, in case of CNTs synthesized by arc discharge, purification of CNTs was also obtained due to the higher electrophoretic velocity of carbon nanotubes than those of other carbon species. It indicates that electrophoresis can be used as the purification method of CNTs. As the result of I-V measurement, CNTs synthesized by arc discharge showed the lowest turn-on-field (J=30nA/cm2) of 1.77V/μm. On the other hand, CNTs synthesized by vapor phase growth showed a little higher turn-on-field of 2.28V/μm. Moreover, turn-on-field of acid treated CNTs had the highest value of 2.77V/μm. These differences might result from the difference in the electrical conductivity as well as the structural quality of CNTs such as wall and caps structures, radius, defect density, and density of CNTs.
|Number of pages||3|
|Journal||Physica B: Condensed Matter|
|Publication status||Published - 2002 Oct|
|Event||Proceedings of the Tsukuba Symposium on Carbon Nanotube in Com (CNT10) - Tsukuba, Japan|
Duration: 2001 Oct 3 → 2001 Oct 5
Bibliographical noteFunding Information:
This work was supported by BK21 program. In addition, we thank Iljin Nanotech & Nanotube Research Lab. in Kunsan Nat. Univ. for providing the multi-walled nanotubes.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering