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

Abstract

Atmospheric pressure dielectric barrier discharge (DBD) in Ar/H2 gas feed with C2H2 or CH4 admixture was studied at room and high temperature of 680 °C by plasma diagnostics (electrical measurements, fast camera imaging, and optical emission spectroscopy). It was shown that filamentary DBD in pure Ar or Ar/H2 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 °C) in Ar/H2/C2H2 and Ar/H2/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.

Carboxyl-rich coatings deposited by atmospheric plasma co-polymerization of maleic anhydride and acetylene

“…S1 (see Supporting Information). Recently, it was shown that DBD in Ar/C 2 H 2 mixture can be ignited in the homogeneous mode, so called atmospheric pressure glow discharge (APGD) [42]. The appearance of several current peaks was attributed to the fact that the discharge did not burn in the whole discharge gap at the same time.…”

“…Therefore, it is advantageous to find a monomer which whose admixture will lead to the ignition of DBD in a homogeneous mode. Recently, Eliáš et al demonstrated that the so called atmospheric pressure glow discharge (APGD) can be ignited in the mixture of Ar and C 2 H 2 [42].…”

Atmospheric Pressure Plasma Polymerized Oxazoline-Based Thin Films—Antibacterial Properties and Cytocompatibility Performance

“…Plasma polymerization is known to be a suitable method for the deposition of many biomaterial coatings [8,9]. Plasma polymerization is in the class of plasma-enhanced chemical vapor deposition (PECVD) methods, which are successfully used for example for thin film deposition [10], surface modification [11,12], or growing of nanomaterials [13][14][15]. Plasma deposition of 2-methyl-2-oxazoline and 2-ethyl-2-oxazoline has already been performed in low-pressure radio frequency (RF) discharge [16][17][18].…”

Physical Crop Postharvest Storage and Protection Methods

“…During the cleaning process, the high energy plasma level disrupted the structure of organic substances contaminating the material and removed impurities from the surface [130]. Plasma is also used in the industrial production of nanomaterials [131,132] and synthesis and application of thin coatings [133][134][135].…”