Field electron emission from sputter-induced carbon nanofibers grown at room temperature

Masaki Tanemura, J. Tanaka, K. Itoh, Y. Fujimoto, Y. Agawa, L. Miao, S. Tanemura

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

Graphite, carbon-coated silicon, and carbon-coated nickel surfaces were bombarded with obliquely incident Ar+ ions at room temperature. The sputtered surfaces were covered with conical protrusions, ∼2.5 × 105 mm-2 or higher in numerical density, and partially aligned single carbon nanofibers (CNFs), ∼20 nm in diameter and 0.3-2 μm in length, grew on the tips. They were characterized by the amorphous nature and the boundaryless structure between the CNF and the conical base. The field electron emission measurements for the CNFs thus grown on the carbon-coated silicon substrate showed the threshold field of 1.8 V/μm with a current density of 1 μA/cm2, and the field enhancement factor was estimated to be 1951 from the Fowler-Nordheim plot assuming the work function of 4.6 eV for graphite. The morphological structure of CNFs grown on conical bases was thought to be effective to reduce the screening effect due to sufficient distance between adjacent CNFs. Thus, the sputter-induced CNFs were concluded to be quite promising as a field electron emission source.

Original languageEnglish
Article number113107
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number11
DOIs
Publication statusPublished - 2005 Mar 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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