Surfaces, Electron and Ion Emission

Nikolski, K.N.; Baturin, A. S.; Knyazev, A. I.; Tchesov, R.G.; Sheshin, E.P.

doi:10.1134/1.1648964

Tech. Phys.

2004

DOI: 10.1134/1.1648964

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Surfaces, Electron and Ion Emission

K.N. Nikolski

A. S. Baturin

A. I. Knyazev

et al.

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“…These are quite different from the rings observed in FEM images by Saito et al 15 which they attributed to the open section of multiwall nanotubes ͑MWNTs͒. Also, circular patterns were also observed 16,17 which were somewhat different from those just mentioned with the less sharp and less round circles.…”

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confidence: 68%

“…Another explanation for the rings is that they are formed by the secondary electrons generated at the screen that are reattracted to the surface in the diode configuration. 17 This may explain the somewhat different rings of Refs. 16 and 17 but are unlikely to explain the sharp rings found in experiment and this explanation does not bring in the temperature of the emitter.…”

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confidence: 90%

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Ring patterns in high-current field emission from carbon nanotubes

et al. 2009

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In this paper we explain the origin of the ring structure that sometimes forms a sharp border surrounding field-emission electron microscopy patterns from carbon nanotubes ͑CNTs͒ at high current. The rings turn out to be due to the self-focusing of thermal-field electrons emitted from the near-cap shank of a CNT that reaches high temperature through Joule heating. To prove this we have simulated the electrostatic fields, the dependence of electron emission on field, temperature, and position on the CNT, and the emitted electron trajectories for different CNT/electrode geometries. The rings are formed when the manifold of emitted electron trajectories folds over onto itself due to self-focusing by the back-support plane. Sufficient thermal electron currents can only be emitted because CNTs can maintain a continuous high-temperature self-heating state, a state for now unique to carbon nanotubes. We do not need to evoke space charge effects and a program based on Green's functions is to calculate the field emission current for all values of field and temperature. The original observation of this phenomenon goes back to at least the pulsed high current experiments on W emitters in the 1950s ͓W.

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confidence: 90%

Ring patterns in high-current field emission from carbon nanotubes

et al. 2009

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Effect of the topology of a graphene/SiC nanotip emitter on the formation of rings in high electric fields

Svetlichnyi

Jityaev

2017

Jetp Lett.

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Surfaces, Electron and Ion Emission

Cited by 2 publications

References 1 publication

Ring patterns in high-current field emission from carbon nanotubes

Ring patterns in high-current field emission from carbon nanotubes

Effect of the topology of a graphene/SiC nanotip emitter on the formation of rings in high electric fields

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