Abstract
By applying a critical bias field instead of conventional surface treatments, the electron emission properties of screen-printed nanotubes were investigated through scanning electron microscopy and emission current-voltage characteristics. After the surface treatment, at the bias field of 2.5V∕μm, the electron emission current density with good uniform emission sites reached the value of 2.13mA∕cm2, which was 400 times higher than that of the untreated sample, and the turn-on voltage decreased markedly from 700to460V. In addition, the enhancement of the alignment of carbon nanotubes to the vertical direction was observed, resulting in an increase in the field-enhancement factor.
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