Effect of arc current on characteristics of nanocarbons prepared by cryogenic arc discharge method

초록

A variety of nanocarbons (nanohorns, nanoflowers and nanoclusters) could be prepared by arc discharge in cryogenic nitrogen with either graphite-graphite or iron-graphite electrodes manipulated by a strategy of automatic electrode delivering. Based on local thermal equilibrium assumption, magneto-hydrodynamic equations were taken into account for estimating the arc power efficiency of 60-84%, depending on the electrode combination. The effects of arc current on the morphology and yield of nanocarbons were investigated within a range of 75-150 A. Transmission electron microscopic analyses revealed that the synthesized product consisted of single-walled carbon nanohorns and multi-walled carbon nanoflowers with nominal diameters of 100-200 nm when graphite-graphite electrodes were employed but nanoclusters containing Fe nanoparticles inside carbon nanoshells with smaller size of 70-120 nm were mainly synthesized by iron-graphite electrodes subject to arc discharge in cryogenic nitrogen. (C) 2010 The Korean Society of industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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