科研之友
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摘要
The resolution of the electron microscope is now largely limited by the performance of its electron source when various aberrations in the electron imaging system, especially spherical aberrations, are corrected. A nanowire tip could be an ideal point electron source, where electrons are emitted from a small physical area. In this article, we review recent advances in electric-field-induced electron emission using a single nanowire, specifically, single-crystalline lanthanum hexaboride (LaB6) nanowire, compared to the state-of-the-art contemporary tungsten cold-field electron emitter W(310) as well as single atom tip and single-carbon nanotube emitters. Owing to its low work function, improved emission stability, and high emission brightness, the LaB6 nanowire as a cold-field-emission electron source offers a new and exciting opportunity for developing the next generation of electron microscopes.
- 出版日期2017-7
