Small tip-type CNT emitters with the diameter of 0.8mm were fabricated for miniaturized X-ray tubes. The CNT emitters were\r\nprepared by dropping CNTs and silver nanoparticles on a flat surface of a W metal tip followed by annealing at 800?C for 2 h\r\nunder vacuum. The CNT emitters exhibit good field emission properties with the threshold electric field of 1.15 V/�µm and the\r\nfield enhancement factor of 12,050. CNTs were well attached to a flat W tip surface without coating on the side plane of the tip,\r\nand thus beam divergence could be minimized. Consequently, a miniaturized X-ray tube with the inner diameter of 5mm was\r\nsuccessfully demonstrated using the tip-type CNT emitter.
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