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https://doi.org/10.1038/s41467-018-03721-y
Title: | A high-brightness large-diameter graphene coated point cathode field emission electron source |
Authors: | Shao, X Srinivasan, A Ang, W.K Khursheed, A |
Keywords: | carbon graphene nickel tungsten diameter electrode electron electron microscopy experimental study field method Article brightness chemical composition current density electron beam electron diffraction electron microscopy energy energy dispersive X ray spectroscopy field emission Fourier transformation high resolution transmission electron microscopy Raman spectrometry scanning electron microscopy selected area electron diffraction temperature stress transmission electron microscopy vacuum |
Issue Date: | 2018 |
Publisher: | Nature Publishing Group |
Citation: | Shao, X, Srinivasan, A, Ang, W.K, Khursheed, A (2018). A high-brightness large-diameter graphene coated point cathode field emission electron source. Nature Communications 9 (1) : 1288. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-018-03721-y |
Abstract: | There have been several long-standing problems of cold field emission sources for electron microscopy and lithography that have prevented their widespread use, such as their inherent ultrahigh vacuum condition requirement (<10-9 torr), relatively poor current stability and rapid emission decay. This paper presents a cold field emission electron source which overcomes these problems based upon using a graphene-coated nickel point cathode. Preliminary experiments demonstrate that it provides stable emission for relatively large tip diameters (micron sizes), can operate in high vacuum conditions (>10-8 torr) and has an ultralow work function value of 1.10 ± 0.07 eV. It has an estimated reduced brightness value of 1.46 × 109 A m-2 sr-1 V-1 for cathode tip-radius of 170 nm and the measured energy spread ranges from 0.246 eV to 0.420 eV for a tip radii range of 260 nm to 500 nm, which is comparable to state-of-the-art conventional cold field emission sources. © 2018 The Author(s). |
Source Title: | Nature Communications |
URI: | https://scholarbank.nus.edu.sg/handle/10635/174233 |
ISSN: | 2041-1723 |
DOI: | 10.1038/s41467-018-03721-y |
Appears in Collections: | Elements Staff Publications |
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