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Point-type carbon nanotube (CNT) field emitters have attracted much interest because they can promise a focused electron beam spot with a high emission current. The point-type CNT field emitters can be used for diverse applications such as x-ray tubes, electron beam sources and microwave sources. Here, we report fabrication and emission performance of various point-type field emitters made by CNTs.
Graphite nanoneedles (GRANN) and graphite emitter inflamed at high temperature (GFEIHT) are known to exhibit unique field emission properties: the brightness of these emitters are as high as that of CNT, while these emitters can achieve high emission current of 2 mA. In this study, graphite-based field emitters were fabricated and their surface structures were investigated in order to explain their...
An attempt was made to fabricate diamond field emitter array that can utilize negative electron affinity. Nitrogen-doped polycrystalline diamond was shaped into flat-topped pyramids by using mold-growth method. Field emission property of the fabricated diamond FEA was evaluated using I–V characteristic.
A photocathode based on n-doped graphene emitters in series to a GaAs photoswitch was fabricated and used for pulsed field electron emission. The n-doped graphene array emits at low turn-on fields (< 3 V/µm). A fast photomodulation of the emission current with high on/off ratio ∼200 was achieved with a semi-insulating (s.i.) GaAs photoswitch in a diode configuration. Different laser sources were...
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