Low-threshold field emission from carbon nano-clusters

Yafyasov, A. M.; Bogevolnov, V. B.; Fursey, G. N.; Павлов, Б. С.; Polyakov, M. A.; Ибрагимов, А. А.

doi:10.1016/j.ultramic.2010.12.035

Cited by 29 publications

(19 citation statements)

References 22 publications

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“…In numerous recent experiments, see for instance [1][2][3][4][5][6][7][8], extremely low-threshold field emission from the carbon nano-clusters was observed for electric fields (10 4 − 10 5 V/cm). This is a surprisingly strong effect, because the field initiating a noticeable emission from these materials is 2-3 orders less than the field required for the field-emission from the traditional metals and semiconductors.…”

Section: Brief Review Of Modern Experiments In the Low-threshold Fielmentioning

confidence: 99%

“…This completely classical explanation of the low -threshold emission phenomenon is not universal, and certainly non valid for carbon-covered cathodes. This has been considered in our recent papers [2,3,7] because the surface of the carbon flakes, obtained by the detonation synthesis are perfectly smooth with rare and relatively small protrusions. These protrusions are able to lower the threshold by a factor of 5, while a lowering factor of 10 2 is observed in our experiments.…”

Section: Brief Review Of Modern Experiments In the Low-threshold Fielmentioning

confidence: 99%

“…These protrusions are able to lower the threshold by a factor of 5, while a lowering factor of 10 2 is observed in our experiments. We suggested in [2,3,7] an alternative explanation of the threshold lowering (field enhancement) based on the dimensional quantization in the under-surface space-charge region on the metal-graphene interface. Recent experiments done by our group confirm the continuity of spectrum 2D-size quantization and allow us to estimate the effective mass m * and the de Broglie wavelength in space-charge region depending on electron's concentration n ex = 1 q τ 0 J(t)dt, where j = I/S, I = 80 A is the current and S ≈ 0.75 cm 2 -the area of the cathode, τ ≈ 2 × 10 −9 s. Monitoring of current density allows us to estimate the experimental density of charges Q = 2.4 × 10 −7 Coul/cm 2 , which corresponds to density of electrons n ≈ 1.3 × 10 12 cm −2 .…”

Section: Brief Review Of Modern Experiments In the Low-threshold Fielmentioning

confidence: 99%

“…In our papers [2,7] we assume that the spectrum of the size quantization is discrete and reduced to several discrete levels. Based on this assumption, we developed a resonance version of the classical Fowler-Nordheim machinery, considering the complex levels as resonances.…”

Section: Brief Review Of Modern Experiments In the Low-threshold Fielmentioning

confidence: 99%

“…In [2] we emulated T by delta-barrier supplied with inner structure defined by a differential operator on a finite interval. We realize that this differential operator does not have any physical meaning itself, but serves just as a mathematical detail of the model.…”

Section: The Resonance Interpretationmentioning

confidence: 99%

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Dimensional Quantization and the Resonance Concept of the Low-Threshold Field Emission

et al. 2015

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We present a brief critical review of modern theoretical interpretations of the low-threshold field emission phenomenon for metallic electrodes covered with carbon structures, taking the latest experiments into consideration, and confirming the continuity of spectrum of resonance states localized on the interface of the metallic body of the cathode and the carbon cover. Our proposal allowed us to interpret the double maxima of the emitted electron's distribution on full energy. The theoretical interpretation is presented in a previous paper which describes the (1 + 1) model of a periodic 1D continuous interface. The overlapping of the double maxima may be interpreted taking into account a 2D superlattice periodic structure of the metal-vacuum interface, while the energy of emitted electrons lies on the overlapping spectral gaps of the interface 2D periodic lattice.

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