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Title: Quantitative imaging of carbon dimer precursor for nanomaterial synthesis in the carbon arc
Contributors: Vekselman, V.
Khrabry, A.
Kaganovich, I.
Stratton, B.
Selinsky, R. S.
Raitses, Y.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: arc nanomaterial synthesis
laser induced fluorescence
atmospheric plasma diagnostic
arc discharge
Issue Date: Jan-2018
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Plasma Sources Science and Technology, vol. 27, p. 02008, 2018
Abstract: Delineating the dominant processes responsible for nanomaterial synthesis in a plasma environment requires measurements of the precursor species contributing to the growth of nanostructures. We performed comprehensive measurements of spatial and temporal profiles of carbon dimers in sub-atmospheric-pressure carbon arc by laser-induced fluorescence. Measured spatial profiles of carbon dimers coincide with the growth region of carbon nanotubes (Fang et al 2016 Carbon 107 273-80) and vary depending on the arc operation mode, which is determined by the discharge current and the ablation rate of the graphite anode. The carbon dimer density profile exhibits large spatial and time variations due to motion of the arc core. A comparison of the experimental data with the 2D simulation results of self-consistent arc modeling shows a good agreement. The model predicts well the main processes determining spatial profiles of carbon dimers.
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Appears in Collections:Plasma Science & Technology

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