Field emission from isolated individual vertically aligned carbon nanocones

Abstract

Field emission from isolated individual vertically aligned carbon nanocones ͑VACNCs͒ has been measured using a small-diameter moveable probe. The probe was scanned parallel to the sample plane to locate the VACNCs, and perpendicular to the sample plane to measure the emission turn-on electric field of each VACNC. Individual VACNCs can be good field emitters. The emission threshold field depends on the geometric aspect ratio ͑height/tip radius͒ of the VACNC and is lowest when a sharp tip is present. VACNCs exposed to a reactive ion etch process demonstrate a lowered emission threshold field while maintaining a similar aspect ratio. Individual VACNCs can have low emission thresholds, carry high current densities, and have long emission lifetime. This makes them very promising for various field emission applications for which deterministic placement of the emitter with submicron accuracy is needed.

Field Emission of Single‐Layer Graphene Films Prepared by Electrophoretic Deposition

“…Since the first demonstration of the electron field emission of carbon nanotubes (CNTs), [1] various low-dimensional carbon materials, including nanotubes, [1][2][3][4][5][6] nanofibers, [7] nanohelices, [8] nanotips, [9] nanorods, [10] nanocones, [11] and nanowalls [12] have been extensively studied to explore their applications as electron sources because of their unique structure, and excellent electronic and mechanical properties. Especially, CNTs demonstrate promising electron-field-emission properties far superior to the conventional field emitters: low turn-on voltage and high emission current.…”

Solution Phase Synthesis of Cu(OH)2 Nanoribbons by Coordination Self-Assembly Using Cu2S Nanowires as Precursors

“…In addition to the cylindrical nanowires, nanocables, 30,31 nanotubes, 32,33 nanocones, 34 nanoneedles, 35 nanostrips, 36 nanoribbons, [37][38][39][40] and nanobelts 8,41,42 have also been fabricated at high temperatures.…”

Plasma-controlled metal catalyst saturation and the initial stage of carbon nanostructure array growth

“…[3][4][5][6][7][8] In most of these applications, high aspect ratio and vertically aligned nanostructures 9 can sustain a high electron current and strong electron field emission from the sharp tips, which often have a radius of curvature of several nanometers. [10][11][12] Such applications impose very strict requirements on the height uniformity of the carbon nanostructures throughout the entire array. Indeed, a nonuniform array that consists of nanostructures of different lengths cannot provide adequate emission parameters ͑e.g., current density and service lifetime͒ due to overload.…”