Self-Assembled Growth, Microstructure, and Field-Emission High-Performance of Ultrathin Diamond Nanorods
Author
Summary, in English
We report the growth of ultrathin diamond nanorods (DNRs) by a microwave plasma assisted chemical vapor deposition method using a mixture gas of nitrogen and methane. DNRs have a diameter as thin as 2.1 nm, which is not only smaller than reported one-dimensional diamond nanostructures (4-300 nm) but also smaller than the theoretical value for energetically stable DNRs. The ultrathin DNR is encapsulated in tapered carbon nanotubes (CNTs) with an orientation relation of (111)(diamond)//(0002)(graphite). Together with diamond nanoclusters and multilayer graphene nanowires/nano-onions, DNRs are self-assembled into isolated electron-emitting spherules and exhibit a low-threshold, high current-density (flat panel display threshold: 10 mA/cm(2) at 2.9 V/mu m) field emission performance, better than that of all other conventional (Mo and Si tips, etc.) and popular nanostructural (ZnO nanostructure and nanodiamond, etc.) field emitters except for oriented CNTs. The forming mechanism of DNRs is suggested based on a heterogeneous self-catalytic vapor-solid process. This novel DNRs-based integrated nanostructure has not only a theoretical significance but also has a potential for use as low-power cold cathodes.
Department/s
Publishing year
2009
Language
English
Pages
1032-1038
Publication/Series
ACS Nano
Volume
3
Issue
4
Document type
Journal article
Publisher
The American Chemical Society (ACS)
Topic
- Nano Technology
Keywords
- PEEM
- HAADF
- aberration-corrected TEM
- diamond nanorods
- carbon nanotube
- NEXAFS
- field emission
Status
Published
ISBN/ISSN/Other
- ISSN: 1936-086X