Abstract
An effect of argon (Ar) plasma pretreatment, followed by krypton-fluoride (KrF) laser irradiation, of multiwalled carbon-nanotube (MWCNT) cathodes on field-emission (FE) characteristics was investigated. With an Ar plasma pretreatment of 100W, the FE current density was increased to 32.6mA∕cm2 at an electric field of 4.92V∕μm after laser irradiation, the value of which was about 30 times higher than the current density without plasma pretreatment. The emission-site density (ESD) was also increased by 25 times by a plasma pretreatment of 100W. However, the further increase in plasma power at and above 150W deteriorated both FE characteristics and ESD, which was due to the decrease in the number of MWCNT emission sites.
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