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Improved field emission currents of carbon nanotubes after laser irradiationopen access

Authors
Lee, JungwooPark, JaehongYi, Whikun
Issue Date
Oct-2006
Publisher
WILEY-V C H VERLAG GMBH
Keywords
field emission; carbon nanotube; laser irradiation; silver paste; electrical contact
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.27, no.10, pp.1651 - 1654
Indexed
SCIE
SCOPUS
KCI
Journal Title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume
27
Number
10
Start Page
1651
End Page
1654
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/180960
DOI
10.5012/bkcs.2006.27.10.1651
ISSN
0253-2964
Abstract
Field emission (FE) currents were measured for silver-pasted and glass-pasted single-walled carbon nanotubes (SWNTs) after illuminating the tubes with a pulsed 532 nm laser. A very low turn-on field of approximately 0.4 V/mu m and a high current density similar to 1700 mu A/cm(2) at 3.5 V/mu m was obtained for the silver-pasted SWNTs after laser irradiation but on the whole, no improvements were found for the glass-pasted SWNTs. Two roles of laser irradiation for the silver-pasted SWNTs were proposed. First, the embedded SWNTs and SWNT bundles inside the silver paste were immerged on the outer surface due to an instantaneous melting or annealing of the silver metals by the laser resulting in an increase of the field emission sites. Second, the laser irradiation was thought to improve the electrical contact between SWNTs and the silver metal by reducing the contact resistance via laser-induced thermal annealing, which was responsible for increasing the FE currents.
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