Journal
ACS NANO
Volume 4, Issue 8, Pages 4396-4402Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1013353
Keywords
carbon onion; field emission; point electron sources; tungsten tip; TEM-STM; carbon nanotube
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Funding
- International Center for Materials Nanoarchitectonics (MANA) of the National Institute for Materials Science (NIMS), Tsukuba, Japan
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The novel type of an electron field emitter is demonstrated by welding a single carbon onion onto the end of a tungsten tip inside a high-resolution transmission electron microscope. Such merged structure is found to markedly reduce the onset voltage peculiar to a standard tungsten field emitter due to the small size of the onion and its highly curved surface. Similar to short carbon nanotubes, individual C-onion emitters can sustain large emission currents, more than 100 mu A, and exhibit good long-term emission stability. Moreover the insertion of a high electrical resistance in series can suppress the current fluctuation to only 1.9%. All these properties make these newly created field emitters promising candidates for the advanced point electron sources.
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