Abstract
In this paper, the electron field emission characteristics of carbon nanotubes (CNTs) and undoped nano-diamond film have been investigated and compared by measuring the electron field emission I-V curve, the emission site density and the emission stability. The CNTs and undoped nano-diamond film were grown in the same microwave plasma enhanced chemical vapor deposition reactor using CH4/H2 and CH4/Ar mixtures, respectively. The morphologies and structures of CNTs and nano-diamond were characterized using field emission scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The field emission results show that CNTs exhibit a lower threshold electric field of 1.3 V/μm and a much higher emission current density of 1620 μA/cm2 at 2.72 V/μm compared to nano-diamond, which exhibits 3.8 V/μm and 540 μA/cm2 at 6.65 V/μm, respectively. However, CNTs have slightly lower emission stability than the nano-diamond.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 8-14 |
| Number of pages | 7 |
| Journal | Diamond and Related Materials |
| Volume | 12 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2003 |
| Externally published | Yes |
Keywords
- Carbon nanotubes
- Electron field emission
- MPECVD
- Nano-diamond
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Chemistry
- Mechanical Engineering
- Materials Chemistry
- Electrical and Electronic Engineering