Atmospheric pressure barrier discharge at high temperature: Diagnostics and carbon nanotubes deposition

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Authors

ELIÁŠ Marek KLOC Petr JAŠEK Ondřej MAZÁNKOVÁ Věra TRUNEC David HRDÝ Radim ZAJÍČKOVÁ Lenka

Year of publication 2015
Type Article in Periodical
Magazine / Source Journal of Applied Physics
MU Faculty or unit

Central European Institute of Technology

Citation
Web web vydavatele
Doi http://dx.doi.org/10.1063/1.4914062
Field Plasma physics
Keywords barrier discharge; high temperature; plasma diagnostics; carbon nanotubes
Attached files
Description Atmospheric pressure dielectric barrier discharge (DBD) in Ar/H-2 gas feed with C2H2 or CH4 admixture was studied at room and high temperature of 680 degrees C by plasma diagnostics (electrical measurements, fast camera imaging, and optical emission spectroscopy). It was shown that filamentary DBD in pure Ar or Ar/H-2 can be converted into homogeneous discharge by an acetylene admixture. Fast intensified charge-coupled device (ICCD) camera proved that this homogeneous discharge is an atmospheric pressure glow discharge (APGD) at room temperature whereas at high temperature the discharge mode switches at every half-period between APGD and atmospheric pressure Townsend discharge. The high temperature discharges (610-710 degrees C) in Ar/H-2/C2H2 and Ar/H-2/CH4 were also investigated with respect to a surface bound deposition of carbon nanotubes using 5 nm thick iron layer as a catalyst. CNTs were deposited without any dedicated catalyst pretreatment phase. The quality of CNTs, namely, their density, vertical alignment, and width of the diameter distribution, was better for the C2H2 gas feed and higher temperatures. (C) 2015 AIP Publishing LLC.
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