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http://dx.doi.org/10.5012/bkcs.2006.27.10.1651

Improved Field Emission Currents of Carbon Nanotubes after Laser Irradiation  

Lee, Jung-Woo (Department of Chemistry, Hanyang University)
Park, Jae-Hong (Department of Chemistry, Hanyang University)
Yi, Whi-Kun (Department of Chemistry, Hanyang University)
Publication Information
Bulletin of the Korean Chemical Society / v.27, no.10, 2006 , pp. 1651-1654 More about this Journal
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/m m and a high current density ~1700 $\mu A/cm^2$ at 3.5 V/m 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.
Keywords
Field emission; Carbon nanotube; Laser irradiation; Silver paste; Electrical contact;
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