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Effect of double layer coating on carbon nanotubes for field emission and secondary electron emission measurement

Authors
Lee, JungwooPark, JaehongKim, JeongyoulYi, Whikun
Issue Date
Mar-2007
Publisher
A V S AMER INST PHYSICS
Citation
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, v.25, no.2, pp.570 - 574
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
Volume
25
Number
2
Start Page
570
End Page
574
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/180385
DOI
10.1116/1.2409946
ISSN
1071-1023
Abstract
Field emissions of wide-band-gap-material (WBGM)-coated single-walled carbon nanotubes (SWCNTs) were studied. Field emission current was gradually increased after monolayer coating (MgO-coated SWCNTs) and successive double layer coating (CsI/MgO-coated SWCNTs). The turn-on field decreased from 3.26 to 2.43 and 1.61 mu A cm(-2), respectively. The calculated work functions were found to be 3.34 and 3.01 eV, and the maximum secondary electron emission yields were 115 and 40 for MgO- and CsI/MgO-coated SWCNTs, respectively. These results would be due to a higher electric field generation around the SWCNT surface after double layer WBGM coating rather than single layer WBGM coating. To reveal the influence of WBGM coating on carbon nanotubes, x-ray photoelectron spectroscopy and energy dispersive analysis of x-ray spectra were analyzed.
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