Number of arcing events and FESEM images of the fabricated CNT emitters on kovar substrates. (a) The number of arcing events of the CNT emitter fabricated using the metal mixture binder with time at a current density of 40 mA/cm2. (b) Magnified FESEM image of the CNT/metal mixture binder after field emission tests. (c) FESEM image of a CNT/metal mixture binder coated on a kovar metal tip annealed at 900°C (inset: magnified FESEM image of the surface of the kovar substrate).
Ha et al. Nanoscale Research Letters 2013 8:355 doi:10.1186/1556-276X-8-355