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28 Mar 2005

Volume 86, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 86, 131114 (2005); http://dx.doi.org/10.1063/1.1889243 (3 pages)

R. Chan, M. Feng, N. Holonyak, and G. Walter
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Single-crystalline polytetrafluoroethylene-like nanotubes prepared from atmospheric plasma discharge

J. Zhang, Y. Guo, J. Z. Xu, X. S. Fang, H. K. Xie, D. L. Shi, P. He, and W. J. van Ooij

Appl. Phys. Lett. 86, 131501 (2005); http://dx.doi.org/10.1063/1.1894598 (3 pages) | Cited 11 times

Online Publication Date: 21 March 2005

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Atmospheric plasma polymerization of perfluorohexane was investigated in this letter. A large quantity of single-crystalline polytetrafluoroethylene (PTFE)-like nanotubes were formed on a simultaneously deposited film at room temperature without any catalysts or templates. The outer diameter of the nanotubes varied from 60 to 1200 nm with a maximum aspect ratio up to 100:1. Transmission electron microscopy and x-ray diffraction results indicated a single crystal close-packed hexagonal (cph) structure in the nanotubes. Polarization optical micrographs of the nanotubes showed their thermal stability comparable to PTFE. It is suggested that the plasma filament played a key role in the rapid formation of the nanotubes. This atmospheric plasma discharge synthesis can serve as a common method for nanofabrication of many other single-crystalline polymer systems.
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81.07.De Nanotubes
81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
61.46.-w Structure of nanoscale materials
61.41.+e Polymers, elastomers, and plastics
52.77.-j Plasma applications
68.37.Lp Transmission electron microscopy (TEM)

Effect of triggered discharge using an excimer laser with high-repetition-rate of the order of kilohertz

Michiteru Yamaura, Takashi Watanabe, Nobuya Hayashi, and Satoshi Ihara

Appl. Phys. Lett. 86, 131502 (2005); http://dx.doi.org/10.1063/1.1896104 (3 pages) | Cited 2 times

Online Publication Date: 22 March 2005

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The triggering ability of the laser-triggered lightning method is improved by using a KrF excimer laser with a high-repetition-rate of the order of kHz order. It is clarified that the effect of a triggered discharge is considerably enhanced when the plasma density is greater than 1013 cm−3. Thus far, the laser-triggered lightning method has not been expected to display a triggering ability since one pulse of an excimer laser possesses energy of less than 1 J, and the produced plasma has a low density of 1012 cm−3, its plasma density is one order lower than that required for its application in the triggering and guiding of lightning discharge. The enhancement of plasma density achieved by utilizing the accumulation effect of charged particles generated by the high-repetition-rate laser was 1013 cm−3. This led to an effective a 50% reduction in the self-breakdown voltage.
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52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Pi High-frequency and RF discharges
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Jm Ionization of plasmas
52.77.-j Plasma applications
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