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Plasma Polymerization in a Nitrogen/Ethanol Dielectric Barrier Discharge: A Parameter Study

  • Annick Van DeynseEmail author
  • Christophe Leys
  • Rino Morent
  • Nathalie De Geyter
Original Paper
  • 17 Downloads

Abstract

Plasma polymerization experiments are typically conducted by sustaining a non-thermal plasma in a gas flow containing monomer molecules. Recently, it was however observed that plasma polymerization can also occur in a nitrogen/2% ethanol vapor dielectric barrier discharge operated at medium pressure (5.0 kPa). To obtain a better understanding of this peculiar plasma polymerization behavior, a detailed parameter study is conducted in this work. The influence of plasma exposure time at fixed discharge power on the coating properties is investigated as well as the influence of discharge power applying a fixed energy density. Results reveal that at a discharge power ≥ 3.0 W, very hydrophilic (WCA values < 11°) coatings are deposited possessing N/C ratios in the range 32–38% and O/C ratios in the range 21–40%. XPS analysis shows that the coatings mainly consist out of amides, amines, imines and nitril/isonitrile groups. FTIR results confirm this conclusion and also show that the C≡N groups are mainly present as isonitriles. With increasing discharge power, a small decrease in O/C ratio is observed combined with an increasing amount of isonitriles. The investigated treatment times also do not affect the surface chemical composition nor the surface wettability suggesting excellent in-depth coating homogeneity. The plasma exposure time does however strongly affect the coating thickness: a linear increase in coating thickness with plasma exposure time is observed in this work. The obtained results thus prove that a nitrogen/ethanol vapor DBD operated at medium pressure is capable of depositing highly hydrophilic nitrogen- and oxygen-rich deposits, which can have applications in different research areas.

Keywords

Nitrogen/ethanol vapor plasma Dielectric barrier discharge Low density polyethylene film Plasma polymerization Oxygen- and nitrogen-rich coatings 

Notes

Acknowledgements

The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement No. 335929 (PLASMATS). The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. The data will be made available on request.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Annick Van Deynse
    • 1
    Email author
  • Christophe Leys
    • 1
  • Rino Morent
    • 1
  • Nathalie De Geyter
    • 1
  1. 1.Department of Applied Physics, Faculty of Engineering and ArchitectureGhent UniversityGhentBelgium

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