Filament discharge enhances field emission properties by making twisted carbon nanofibres stand up

Abstract

Abstract. Twisted carbon nanofibers, named carbon nanotwists (CNTws), in a flocculated form were pasted, printed on the conductive silicon substrate, and then treated by dielectric barrier discharge using He and N 2 gases. Vertically upright nanofibers were clearly obtained by "filament discharge mode" in N 2 gas. As the treating time increased up to ~60 s, the height of the nanofiber tips became uniform. Consequently, the field emission property was greatly enhanced and showed a threshold electric field of 4.6 V/µm and maximum current of 0.433 mA/cm 2 at 8 V/µm.

Syntheses and Electronic Applications of Helical Carbon Nanofibers

“…In addition, the coil diameter of columnar CNCs was smaller than that of the MWCNCs, indicating that the form of columnar CNCs resembles that of CNTw. (Hosokawa et al, 2008), (Yokota et al, 2010), (Takikawa et al, 2000) To our knowledge, the columnar CNCs have not been previously reported though there are reports of MWCNCs. (Kanada et al, 2008), (Lu et al, 2004), (Yang et al, 2003) Fig.…”

“…The field emission property was enhanced by the upright CNTws. (Hosokawa et al, 2008) The detail of experimental conditions is indicated in each of the figure caption.…”

“…SEM micrograph of the emitter treated by 'glow mode.' (Hosokawa et al, 2008) Figure 32 shows the field emission properties of the CNTw emitter treated by the 'filament mode' and emission pattern at a maximum current. Before the treatment, a spark easily occurred at a low electric field.…”

“…As for the untreated CNTws, we measured the length of powdery CNTws before fabricating the emitter. (Hosokawa et al, 2008) …”

High-Yield Synthesis of Helical Carbon Nanofibers Using Iron Oxide Fine Powder as a Catalyst

“…They are also used in nanosprings [26][27][28][29][30], electrode materials in fuel cells [31][32][33][34], field emitters [35][36][37], magnetic sensors [38,39], and various industrial fields [40][41][42].…”