Self-assembled growth, microstructure, and field-emission high-performance of ultrathin diamond nanorods

Naigui Shang, Pagona Papakonstantinou, Peng Wang, Alexei Zakharov, Umesh Palnitkar, I. Nan Lin, Ming Chu, Artemis Stamboulis

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

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/|xm) 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.

Original languageEnglish
Pages (from-to)1032-1038
Number of pages7
JournalACS Nano
Volume3
Issue number4
DOIs
StatePublished - 28 Apr 2009
Externally publishedYes

Keywords

  • Aberration-corrected tem
  • Carbon nanotube
  • Diamond nanorods
  • Field emission
  • Haadf
  • Nexafs
  • Peem

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