Please use this identifier to cite or link to this item: 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
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