P-150: Catalyst-Free Carbon Nanotubes Synthesized on Graphite Flakes by Thermal Chemical Vapor Deposition

In this paper, the carbon nanotubes (CNTs) are synthesized on the micro graphite flakes using mixtures of C2H2 and H2 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. The synthetic process is a catalyst free technique and the CNTs have no metal inside, so this is an easier technique for synthesizing the CNTs. We change the synthetic time to obtain the optimal conditions for synthesis of the CNTs. The experimental results show that the density and quality of the CNTs could be controlled significantly by the synthetic time. Besides, the field emission properties of the CNTs are also affected greatly by it. The emission current density of the CNTs is 0.5 mA/cm2 at 3 V/μm, and the turn on field is 2.3 V/μm.