Deposition of Hydrocarbon Films by Means of Helium‐Ethylene Fed Glow Dielectric Barrier Discharges

Abstract

Summary: The present work provides a detailed study of helium‐ethylene dielectric barrier glow discharges. The effect of ethylene concentration, total gas flow rate, excitation frequency and applied voltage have been investigated in order to clarify both discharge operational mode, and coating composition. The discharge has been characterized by means of electrical measurements and optical emission spectroscopy, while the stable species contained in the gas effluent have been sampled and analyzed using gas chromatography with mass spectrometry detection to achieve indications on the reactive fragments generated inside the discharge. It has been observed that polyethylene‐like coatings can be obtained for a wide range of electrical conditions, and the deposition rates have been found to range between 20 and 80 nm · min−1.

Improving the bonding between henequen fibers and high density polyethylene using atmospheric pressure ethylene-plasma treatments

“…Their results suggest that Ar/O 2 and NH 3 /C 2 H 4 plasmas as potentially useful tools for bone tissue regeneration procedures. The use of the dielectric barrier dischargeprocess (DBD) to generate a reactive cold plasma to modify the surface chemistry of synthetic a natural materials has been explored by several groups [24,25]. It is characterized by relatively low engineering costs, high speed, and simplicity compared to lowpressure (vacuum) plasma techniques.…”

“…The surface functionalization can be carried out in one step and several functional groups, e.g. OH, COOH, NH 2 , CNH, can be grafted on polymer surface depending on monomer selected [21][22][23][24][25]. de Valence et al [26] studied the effect of cold air plasma treatment on the hydrophilicity of electrospun polycaprolactone scaffolds in order to improve cell-material interactions and promote better tissue regeneration for biodegradable vascular graft applications.…”

Atmospheric Pressure Plasma Jet Deposition of Patterned Polymer Films for Cell Culture Applications

“…Carbon, oxygen, and hydrogen containing groups can be identified in the spectrum. Alkane functional groups, in particular, can be recognized: C-H stretching 3000-2800 cm −1 and C-H bending 1480-1370 cm −1 [20]. Oxygen containing groups were also observed in the spectrum: OH (broad band around 3450 cm −1 ) and C = O (1720 cm −1 ) [20].…”

Nonequilibrium Atmospheric Plasma Deposition

“…The common operational mode of atmospheric pressure DBD is filamentary (Ref 54,(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)71), resulting in strong spatial nonuniformity of plasma chemistry that can alter the quality of the films. On the contrary, glow DBD modes (Ref 53,55,56,(68)(69)(70)72), sometimes, referred to as low current atmospheric pressure Townsend-like discharge or high current atmospheric pressure glow-like discharge, are expected to give high quality films. This uniform mode of DBD is observed for a very restricted set of parameters such as gas mixture, dissipated power, operational frequency, etc.…”

“…In Table 1, we list a set of works (Ref [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] showing the various possibilities investigated to deposit thin films by low power sources. The common operational mode of atmospheric pressure DBD is filamentary (Ref 54,(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)71), resulting in strong spatial nonuniformity of plasma chemistry that can alter the quality of the films.…”