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Complex structure of the carbon arc discharge for synthesis of nanotubes

Journal Article · · Plasma Sources Science and Technology

Comprehensive non-invasive spectroscopic techniques and electrical measurements of the carbon arc revealed two distinguishable plasma synthesis regions in the radial direction normal to the arc axis. These regions, which are defined as the arc core and the arc periphery, are shown to have very different compositions of carbon species with different densities and temperatures. The colder arc periphery is dominated by carbon diatomic molecules (C2), which are in the minority in the composition of the hot arc core. These differences are due to a highly non-uniform distribution of the arc current, which is mainly conducted through the arc core populated with carbon atoms and ions. Therefore, the ablation of the graphite anode is governed by the arc core, while the formation of carbon molecules occurs in the colder arc periphery. Furthermore, this result is consistent with previous predictions that the plasma environment in the arc periphery is suitable for synthesis of carbon nanotubes.

Research Organization:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1367352
Alternate ID(s):
OSTI ID: 22724327
Report Number(s):
PPPL--5346
Journal Information:
Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 6 Vol. 26; ISSN 1361-6595
Publisher:
IOP Publishing, Bristol, UKCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Investigation of the short argon arc with hot anode. I. Numerical simulations of non-equilibrium effects in the near-electrode regions journal January 2018
Investigation of the short argon arc with hot anode. II. Analytical model journal January 2018
Multiparametric diagnostic in the synthesis of carbon nanostructures via submerged arc discharge: Stability, nucleation and yield journal November 2019
Multispecies plasma fluid simulation for carbon arc discharge journal January 2019
In situ diagnostics for nanomaterial synthesis in carbon arc plasma journal August 2018
Growth of nanoparticles in dynamic plasma journal June 2019
Synthesis of nanoparticles in carbon arc: measurements and modeling journal May 2018
Investigation of a short argon arc with hot anode. Part I: numerical simulations of non-equilibrium effects in the near-electrode regions text January 2017
Investigation of the Short Argon Arc with Hot Anode, Part II: Analytical Model text January 2017

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