Figure 1

Schematic diagrams of the CNT emitter fabrication. a The 2 μl of CNT mixture drop composed of multi-walled CNT, Ag nanoparticle (NP), and isopropyl alcohol hang down from a tungsten (W) tip end. b, c The CNT and Ag NP mixture are evaporated at the atmosphere to have uniform layer thickness. d The mixture layer is sintered in vacuum ambient ~10⁻¹ Pa at gradually increased temperature of 200°, 300°, 400°, 500°C for 30 min each