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Resonant tunneling and extreme brightness from diamond field emitters and carbon nanotubes
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic representation of the FEM used to examine MWCNTs. Scanning electron micrograph of the nanotube ( protrusion length) used in these experiments (inset).

Image of FIG. 2.
FIG. 2.

FEM micrograph and current vs time of a beam from a single MWCNT. Bright spots corresponding to emission through adsorbates appear against the pentagonal rings from the clean nanotube surface.

Image of FIG. 3.
FIG. 3.

A schematic representation of the energy analyzer/DFEA system. Scanning electron micrograph showing nanotip detail for a diamond field emitter (inset).

Image of FIG. 4.
FIG. 4.

Phosphor screen image of beams from individual diamond emitters in a sparse ( pitch) array. Each beam consists of multiple beamlets that fluctuate in space and time (Ref. 15).

Image of FIG. 5.
FIG. 5.

The current collected from an individual CVD-diamond field emitter fluctuates between discrete, stable levels. Periods of stability can range from fractions of a second to many minutes depending on the operating conditions.

Image of FIG. 6.
FIG. 6.

Measured spectra for a diamond field emitter for fixed experimental conditions. The spectrum fluctuates between a variety of stable configurations coincident with the emitted current fluctuations.

Image of FIG. 7.
FIG. 7.

Measured spectrum for what is believed to be a clean diamond field emitter. It is located near the estimated Fermi energy and has a spectral width of .

Image of FIG. 8.
FIG. 8.

Measured energy spectrum before and after a single adsorbate event. The emission current increased by more than an order of magnitude without affecting the spectral width or shape.

Image of FIG. 9.
FIG. 9.

The measured spectrum during a period of stable emission for various applied voltages. The anode-cathode gap in this case was . Significant spectral changes were observed as the electric field was changed by small amounts.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant tunneling and extreme brightness from diamond field emitters and carbon nanotubes