Applied Surface Science, Vol.256, No.8, 2409-2413, 2010
Enhancement of field emission properties of graphite flakes by producing carbon nanotubes on above using thermal chemical vapor deposition
In order to improve the field emission properties of the graphite flakes, the carbon nanotubes (CNTs) are produced on above without the metallic catalyst using mixtures of C2H2 and H-2 gases by thermal chemical vapor deposition. We spin the graphite solution on the silicon wafer and dry it, then synthesize the CNTs on the graphite flakes. We change the synthetic time to obtain the optimal conditions for enhancement of field emission properties of graphite flakes. The experimental results show that the density and quality of the CNTs could be controlled signicantly by the synthetic time. Besides, the field emission properties of the treated graphite flakes are also affected greatly by it. The emission current density of the treated graphite flakes reaches to 0.5 mA/cm(2) at 3 V/mu m, and the turn-on field is decreased from 7.7 to 1.9 V/mu m after producing the CNTs on above. (C) 2009 Elsevier B. V. All rights reserved.
Keywords:Graphite flake;Carbon nanotube;Carbon nanoparticle;Thermal chemical vapor deposition;Field emission