화학공학소재연구정보센터
Applied Surface Science, Vol.251, No.1-4, 230-235, 2005
Cathode units with a carbon fiber field emitter
We have developed a carbon fiber field emitter (CFFE) with a diameter of 7 mu m and a bullet shape at the top. We found that a micro-pit on the top of the fiber can focus the emitted electron beam, so that the beam is inside a small solid angle around the axis of symmetry. Our investigations show that due to this effect the fiber emitter with optimized dimensions of the micro-pit has good emission stability, good reproducibility for different cathode samples and high electron optical brightness. The CFFE with micro-pit on the top has been successfully used for 14 years in the "Cwikscan-50A" electron microscope instead of the conventional tungsten field emitter. (c) 2005 Published by Elsevier B.V.