Layer-by-layer assembly of thin organic films on PTFE activated by cold atmospheric plasma

A. Tóth, K. Szentmihályi, Z. Keresztes, Imola Szigyártó, Dusan Kováčik, Mirko Černák, K. Kutasi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

An air diffuse coplanar surface barrier discharge is used to activate the surface of polytetrafluoroethylene (PTFE) samples, which are subsequently coated with polyvinylpyrrolidone (PVP) and tannic acid (TAN) single, bi- and multilayers, respectively, using the dip-coating method. The surfaces are characterized by X-ray Photoelectron Spectroscopy (XPS), Attenuated Total Reflection - Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Atomic Force Microscopy (AFM). The XPS measurements show that with plasma treatment the F/C atomic ratio in the PTFE surface decreases, due to the diminution of the concentration of CF2 moieties, and also oxygen incorporation through formation of new C-O, C=O and O=C-O bonds can be observed. In the case of coated samples, the new bonds indicated by XPS show the bonding between the organic layer and the surface, and thus the stability of layers, while the gradual decrease of the concentration of F atoms with the number of deposited layers proves the creation of PVP/TAN bi- and multi-layers. According to the ATR-FTIR spectra, in the case of PVP/TAN multilayer hydrogen bonding develops between the PVP and TAN, which assures the stability of the multilayer. The AFM lateral friction measurements show that the macromolecular layers homogeneously coat the plasma treated PTFE surface.

Original languageEnglish
Pages (from-to)557-563
Number of pages7
JournalOpen Chemistry
Volume13
Issue number1
DOIs
Publication statusPublished - 2015

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Keywords

  • AFM
  • ATR-FTIR
  • DCSBD plasma
  • Polytetrafluoroethylene surface
  • Polyvinylpyrrolidone and tannic acid layers
  • XPS

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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