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Plasma-target surface interaction during non-equilibrium plasma irradiation at atmospheric pressure: Generation of dusty plasma

Published online by Cambridge University Press:  05 November 2013

Limin Li
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
Chao Liu
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China School of Electronics Science, Northeast Petroleum University, Daqing, China
Xuming Zhang
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
Guosong Wu
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
Ming Zhang
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
Ricky K.Y. Fu
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
Paul K. Chu*
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
*
Address correspondence and reprint requests to: Paul K. Chu, Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. E-mail: paul.chu@cityu.edu.hk

Abstract

The remaining challenges, developing the relativistic electron beam sources, stimulate the investigations of cathode materials. Carbon-fiber-aluminum composite is the most appropriate cathode materials to construct the robust relativistic electron beam sources. Carbon-fiber-aluminum composite is treated by a non-equilibrium atmospheric plasma torch with a copper electrode based on high-voltage gas discharge. The axial and radial distributions of the plasma torch temperature are measured to determine the optimal treatment temperature and location. Copper-oxide particles with diameters of less than 1 µm are deposited onto the surface of the carbon-fibers and a layer of copper-oxide covers the entire surface as the treatment time is increased. Raman spectroscopy suggests that although the locations of the D and G band are similar, the areas of the D and G bands increase after the plasma treatment due to the reduced graphite crystalline size in the carbon-fibers. Analysis of the copper electrode surface discloses materials ablation arising from the discharge which releases copper from the source. Our results reveal that the atmospheric plasma torch generated by high-voltage discharge is promising in the surface modification of the carbon-fiber-reinforced aluminum composite. Further, the plasma produced by atmospheric plasma torch is dusty plasma, due to the participation of liberated copper particles. The plasma torch was analyzed by fluid dynamics, in terms of plasma density, plasma expansion velocity, and internal pressure, and it was found that the plasma produced by atmospheric torch is supersonic flow.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2013 

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