Field emission from nanotube bundle emitters at low fields

Abstract

The fabrication of nanotube field emitters with an onset field as low as 0.8 V/μm is described and the low-field electron emission mechanism is discussed. These emitters are made using nanotube cathode deposit with the addition of epoxy resin. The preferred orientation of nanotubes in nanotube bundles of the deposit is preserved. The nanotube tips are sharpened by exposing the nanotube bundle surface to a microwave oxygen plasma. The local-field enhancement factor is estimated to be 8000 by using the Fowler–Nordheim equation. The low onset field is attributed to the well-distributed, highly orientated sharp tips at the sample surface.

Variety of Bio-Hydrocarbon Precursors for the Synthesis of Carbon Nanotubes

“…This is due to its excellent electrical and mechanical properties, small radius of curvature at the tips and high thermal and chemical stability [4,5]. Several methods have been reported for the synthesis of CNT which were arc discharge [6], laser ablation [7] and chemical vapor deposition (CVD) [8,9] methods.…”

Fabrication of Carbon Nanotubes Field Emission Cathode by Composite Plating

“…[1][2][3][4] It can also be applied to cold cathode field emitter because of its high aspect ratio, large field enhancement factor, and high emission current density with low turn-on electric field. 5 CNT field emission cathodes (CNTFCs) can be made by various methods, such as direct growth, 6 electrophoresis, 7 screen-printing, 8 and spray method. 9 The synthesis of CNTs has been extensively investigated.…”

Enhancement of Field Emission of CNTs Array by CO2-Assisted Chemical Vapor Deposition

“…[6][7][8][9][10][11] To enhance the field emission properties of CNTs, some effective methods have been experimented. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] For example, annealing in oxygen or ozone to open more ends of nanotubes 12 can enhance the field emission (FE) properties of the CNTs, because the open-end nanotubes have circular sharp edges, which may have a smaller radius of curvature than the closed-end nanotubes. Surface treatment of the as-grown CNTs with H 2 , 13 Ar, 15 16 and CF 4 (Ref.…”