Switch-on Phenomena and Field Emission from Multi-Walled Carbon Nanotubes Embedded in Glass
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This paper describes a new design of carbon nanotube tip. NanoclyTM NC 7000 Thin Multiwall Carbon Nanotubes of carbon purity (90%) and average diameter tube 9.5 nm with a high aspect-ratio (>150) were used. These tips were manufactured by employing a drawing technique using a glass puller. The glass microemitters with internal carbon nanotubes show a switch-on effect to a high current level (1 to 20 μA). A field electron microscope with a tip (cathode)–screen (anode) separation at ~10 mm was used to characterize the electron emitters. The system was evacuated down to a base pressure of ~10–9 mbar when baked at up to ~200oC overnight. This allowed measurements of typical Field Electron Emission characteristics; namely the current–voltage (I-V) characteristics and the emission images on a conductive phosphorus screen (the anode). Fowler- Nordheim plots of the current-voltage characteristics show current switch-on for each of these emitters.
Abstract
This paper describes a new design of carbon nanotube tip. NanoclyTM NC 7000 Thin Multiwall Carbon Nanotubes of carbon purity (90%) and average diameter tube 9.5 nm with a high aspect-ratio (>150) were used. These tips were manufactured by employing a drawing technique using a glass puller. The glass microemitters with internal carbon nanotubes show a switch-on effect to a high current level (1 to 20 μA). A field electron microscope with a tip (cathode)–screen (anode) separation at ~10 mm was used to characterize the electron emitters. The system was evacuated down to a base pressure of ~10–9 mbar when baked at up to ~200oC overnight. This allowed measurements of typical Field Electron Emission characteristics; namely the current–voltage (I-V) characteristics and the emission images on a conductive phosphorus screen (the anode). Fowler- Nordheim plots of the current-voltage characteristics show current switch-on for each of these emitters.
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