51st Annual Meeting of the APS Division of Plasma Physics
Volume 54, Number 15
Monday–Friday, November 2–6, 2009;
Atlanta, Georgia
Session GI2: Micro and Low-temperature Plasmas
9:30 AM–12:30 PM,
Tuesday, November 3, 2009
Room: Centennial I
Chair: Martin Lampe, Naval Research Laboratory
Abstract ID: BAPS.2009.DPP.GI2.6
Abstract: GI2.00006 : Exploring Plasma Mechanisms of Carbon Nanostructures Synthesis in Arc Discharge
12:00 PM–12:30 PM
Preview Abstract
Abstract
Author:
Michael Keidar
(George Washington University)
Plasma enhanced approached are widely used for synthesis of
carbon nanostructures. Among several methods for synthesis carbon
nanostructures (single wall carbon nanotubes (SWNT), multi-wall
carbon nanotubes (MWNT), graphene) arc discharge is the most
practical one for scientific and technological purposes due to
the number of advantages in comparison with other techniques.
Firstly, arc discharge method yields highly graphitized
nanostructures with very small defects, because the synthesis
occurs at a very high temperature. As results, arc-grown SWNTs
demonstrate the highest time of emission capability degradation
than those produced by other techniques. Secondly, nanotubes
produced in arc usually demonstrate a high
flexibility, thus eventually demonstrating higher strength
characteristics.
The primary focus of this presentation is to review state of the
art understanding of SWNT synthesis mechanism in arc discharge,
methods and approaches to control parameters of arc discharge.
Fundamental issues related to synthesis of SWNTs, which is
relationship between plasma parameters and SWNT characteristics
will be considered. It is believed that characteristics of
synthesized SWNTs can be controlled by means of plasma
parameters and arc discharge conditions. Effects of electrical
and magnetic fields applied during SWNT synthesis in arc plasma
will be explored. For instance, our recent experiments suggest
that magnetic field has very strong effect on the arc discharge
and the carbon nanostructures synthesis. It is also demonstrated
that the magnetic field has a profound effect on the length of a
SWNT synthesized in the arc discharge. An average length of SWNT
increases by a factor of 2 in discharge with magnetic field as
compared with the discharge without magnetic field, and an amount
of long nanotubes with the length above 5 micron also increases.
Electric and magnetic fields allow effective SWNT transport to
the collection area, in-situ SWNT filtration
from the soot and SWNT separation by their characteristics (e.g.
by chirality, length, structural properties).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DPP.GI2.6