Synthesis of Nanocarbon and its Electronic Applications = Synthesis of Nanocarbon and its Electronic Applications

다국어 초록 (Multilingual Abstract)

The efficient synthesis of vertically-aligned ultra-long carbon nanofibers (CNFs) with sharp tip ends using thermal chemical vapor deposition has been demonstrated. Millimeter-scale CNFs with a diameter of less than 50 nm are readily grown on pd nanocatalysts deposited on Al2O3 substrate, which activate the conical stacking of graphitic platelets. The field emission performance of the as-grown CNFs is better than any previous CNFs due to their extremely high aspect ratio and sharp tip angle. The CNF array field emitter has the turn-on electric field of 0.9 V/ μm, the maximum emission current density of 6.3 mA/cm2 at 2 V/μm, and the field enhancement factor of 2585. For bulk scale graphene synthesis, nitrogen-doped graphene synthesis with ~g scale has been achieved by arc discharge method. The amount of defects formed in the synthesis decreased by adding various metal catalysts, among which Bi2O3 was found to be most effective. Adding dopants to the starting materials increased the electrical conductivity, and the doping concentration in graphene was controlled by adjusting the amount of nitrogen dopants. The arc graphene found its potential application in supercapacitor taking advantage of its large surface area and improved conductivity by doping.