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Title: Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes

Abstract

Radial single-walled carbon nanotubes (radial SWCNTs) are formed by using a direct current (dc) arc discharge when carbon and metal atoms are mixed in a gas phase after the vaporization and cooled together in a liquid droplet. Since SWCNTs sprout through the precipitation of saturated carbon atoms from liquid droplets during cooling, a mass synthesis of radial SWCNTs can be achieved when a large number of liquid droplets are generated. In order to understand the effects of arc peripheral plasma parameters (electrons, ions, radical atoms, and molecules) on the growth of radial SWCNTs, the optimum production efficiency of radial SWCNTs is investigated by superimposing a radio-frequency (rf) plasma on the thermal arc plasma and controlling the arc peripheral plasma density. Two parameters--the rf power and the dc potential--of the rf electrode, which is equipped above 20 mm from the center of an arc-discharge point, are changed with the constant He pressure (200 Torr), dc arc current (75 A), and power (2000 W). The production yield of radial SWCNTs is found to be enhanced under the condition of the rf power of 100 W and the dc component of the rf electrode voltage of -22 V, revealing that the optimum ionmore » flux and ion bombardment energy are important key parameters for the formation of radial SWCNTs.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579 (Japan)
Publication Date:
OSTI Identifier:
20719669
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 98; Journal Issue: 9; Other Information: DOI: 10.1063/1.2128053; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARBON; CERIUM IONS; COOLING; CRYSTAL GROWTH; DIRECT CURRENT; DROPLETS; EFFICIENCY; ELECTRIC POTENTIAL; ELECTRODES; EVAPORATION; HELIUM; NANOTUBES; PLASMA; PLASMA DENSITY; POWER RANGE 01-10 KW; PRECIPITATION; PRESSURE RANGE KILO PA; RADIOWAVE RADIATION

Citation Formats

Sato, Y, Motomiya, K, Jeyadevan, B, Tohji, K, Sato, G, Ishida, H, Hirata, T, Hatakeyama, R, and Department of Electronic Engineering, Tohoku University, Sendai 980-8579. Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes. United States: N. p., 2005. Web. doi:10.1063/1.2128053.
Sato, Y, Motomiya, K, Jeyadevan, B, Tohji, K, Sato, G, Ishida, H, Hirata, T, Hatakeyama, R, & Department of Electronic Engineering, Tohoku University, Sendai 980-8579. Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes. United States. doi:10.1063/1.2128053.
Sato, Y, Motomiya, K, Jeyadevan, B, Tohji, K, Sato, G, Ishida, H, Hirata, T, Hatakeyama, R, and Department of Electronic Engineering, Tohoku University, Sendai 980-8579. Tue . "Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes". United States. doi:10.1063/1.2128053.
@article{osti_20719669,
title = {Effect of cerium ions in an arc peripheral plasma on the growth of radial single-walled carbon nanotubes},
author = {Sato, Y and Motomiya, K and Jeyadevan, B and Tohji, K and Sato, G and Ishida, H and Hirata, T and Hatakeyama, R and Department of Electronic Engineering, Tohoku University, Sendai 980-8579},
abstractNote = {Radial single-walled carbon nanotubes (radial SWCNTs) are formed by using a direct current (dc) arc discharge when carbon and metal atoms are mixed in a gas phase after the vaporization and cooled together in a liquid droplet. Since SWCNTs sprout through the precipitation of saturated carbon atoms from liquid droplets during cooling, a mass synthesis of radial SWCNTs can be achieved when a large number of liquid droplets are generated. In order to understand the effects of arc peripheral plasma parameters (electrons, ions, radical atoms, and molecules) on the growth of radial SWCNTs, the optimum production efficiency of radial SWCNTs is investigated by superimposing a radio-frequency (rf) plasma on the thermal arc plasma and controlling the arc peripheral plasma density. Two parameters--the rf power and the dc potential--of the rf electrode, which is equipped above 20 mm from the center of an arc-discharge point, are changed with the constant He pressure (200 Torr), dc arc current (75 A), and power (2000 W). The production yield of radial SWCNTs is found to be enhanced under the condition of the rf power of 100 W and the dc component of the rf electrode voltage of -22 V, revealing that the optimum ion flux and ion bombardment energy are important key parameters for the formation of radial SWCNTs.},
doi = {10.1063/1.2128053},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 98,
place = {United States},
year = {2005},
month = {11}
}