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Updated: Jun 10, 2026

Preparing a Celadonite Electron Source and Estimating Its Brightness

Preparing a Celadonite Electron Source and Estimating Its Brightness

Published on: November 5, 2019

Carbon "onions" as point electron sources.

Ming-Sheng Wang¹, Dmitri Golberg, Yoshio Bando

¹International Centre for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan. WANG.Mingsheng@nims.go.jp

|August 25, 2010

Summary

Researchers developed a new electron field emitter by attaching a carbon onion to a tungsten tip. This novel structure significantly lowers the required voltage and offers stable, high emission currents, making it ideal for advanced electron sources.

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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

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Published on: July 12, 2016

Area of Science:

Materials Science
Nanotechnology
Physics

Background:

Standard tungsten field emitters have limitations in onset voltage and stability.
Carbon nanostructures, like carbon nanotubes, show promise for electron emission applications.

Purpose of the Study:

To demonstrate a novel electron field emitter using a single carbon onion welded onto a tungsten tip.
To investigate the performance characteristics of this new emitter structure.

Main Methods:

Welding a single carbon onion onto a tungsten tip using a high-resolution transmission electron microscope.
Measuring the onset voltage, emission current, and long-term stability of the fabricated emitter.
Implementing a series high electrical resistance to suppress current fluctuations.

Main Results:

The carbon onion-tungsten tip structure significantly reduced the onset voltage compared to standard tungsten emitters.
Individual emitters sustained large emission currents exceeding 100 muA with good long-term stability.
Insertion of series resistance reduced current fluctuation to 1.9%.

Conclusions:

The novel carbon onion-based field emitter exhibits superior performance characteristics.
These emitters are promising for advanced point electron sources due to low onset voltage, high current, and stability.
Further research into carbon onion emitters could lead to advancements in electron microscopy and other applications.